<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/inflate-0.4.5/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../inflate/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
<span id="2"> 2</span>
<span id="3"> 3</span>
<span id="4"> 4</span>
<span id="5"> 5</span>
<span id="6"> 6</span>
<span id="7"> 7</span>
<span id="8"> 8</span>
<span id="9"> 9</span>
<span id="10"> 10</span>
<span id="11"> 11</span>
<span id="12"> 12</span>
<span id="13"> 13</span>
<span id="14"> 14</span>
<span id="15"> 15</span>
<span id="16"> 16</span>
<span id="17"> 17</span>
<span id="18"> 18</span>
<span id="19"> 19</span>
<span id="20"> 20</span>
<span id="21"> 21</span>
<span id="22"> 22</span>
<span id="23"> 23</span>
<span id="24"> 24</span>
<span id="25"> 25</span>
<span id="26"> 26</span>
<span id="27"> 27</span>
<span id="28"> 28</span>
<span id="29"> 29</span>
<span id="30"> 30</span>
<span id="31"> 31</span>
<span id="32"> 32</span>
<span id="33"> 33</span>
<span id="34"> 34</span>
<span id="35"> 35</span>
<span id="36"> 36</span>
<span id="37"> 37</span>
<span id="38"> 38</span>
<span id="39"> 39</span>
<span id="40"> 40</span>
<span id="41"> 41</span>
<span id="42"> 42</span>
<span id="43"> 43</span>
<span id="44"> 44</span>
<span id="45"> 45</span>
<span id="46"> 46</span>
<span id="47"> 47</span>
<span id="48"> 48</span>
<span id="49"> 49</span>
<span id="50"> 50</span>
<span id="51"> 51</span>
<span id="52"> 52</span>
<span id="53"> 53</span>
<span id="54"> 54</span>
<span id="55"> 55</span>
<span id="56"> 56</span>
<span id="57"> 57</span>
<span id="58"> 58</span>
<span id="59"> 59</span>
<span id="60"> 60</span>
<span id="61"> 61</span>
<span id="62"> 62</span>
<span id="63"> 63</span>
<span id="64"> 64</span>
<span id="65"> 65</span>
<span id="66"> 66</span>
<span id="67"> 67</span>
<span id="68"> 68</span>
<span id="69"> 69</span>
<span id="70"> 70</span>
<span id="71"> 71</span>
<span id="72"> 72</span>
<span id="73"> 73</span>
<span id="74"> 74</span>
<span id="75"> 75</span>
<span id="76"> 76</span>
<span id="77"> 77</span>
<span id="78"> 78</span>
<span id="79"> 79</span>
<span id="80"> 80</span>
<span id="81"> 81</span>
<span id="82"> 82</span>
<span id="83"> 83</span>
<span id="84"> 84</span>
<span id="85"> 85</span>
<span id="86"> 86</span>
<span id="87"> 87</span>
<span id="88"> 88</span>
<span id="89"> 89</span>
<span id="90"> 90</span>
<span id="91"> 91</span>
<span id="92"> 92</span>
<span id="93"> 93</span>
<span id="94"> 94</span>
<span id="95"> 95</span>
<span id="96"> 96</span>
<span id="97"> 97</span>
<span id="98"> 98</span>
<span id="99"> 99</span>
<span id="100"> 100</span>
<span id="101"> 101</span>
<span id="102"> 102</span>
<span id="103"> 103</span>
<span id="104"> 104</span>
<span id="105"> 105</span>
<span id="106"> 106</span>
<span id="107"> 107</span>
<span id="108"> 108</span>
<span id="109"> 109</span>
<span id="110"> 110</span>
<span id="111"> 111</span>
<span id="112"> 112</span>
<span id="113"> 113</span>
<span id="114"> 114</span>
<span id="115"> 115</span>
<span id="116"> 116</span>
<span id="117"> 117</span>
<span id="118"> 118</span>
<span id="119"> 119</span>
<span id="120"> 120</span>
<span id="121"> 121</span>
<span id="122"> 122</span>
<span id="123"> 123</span>
<span id="124"> 124</span>
<span id="125"> 125</span>
<span id="126"> 126</span>
<span id="127"> 127</span>
<span id="128"> 128</span>
<span id="129"> 129</span>
<span id="130"> 130</span>
<span id="131"> 131</span>
<span id="132"> 132</span>
<span id="133"> 133</span>
<span id="134"> 134</span>
<span id="135"> 135</span>
<span id="136"> 136</span>
<span id="137"> 137</span>
<span id="138"> 138</span>
<span id="139"> 139</span>
<span id="140"> 140</span>
<span id="141"> 141</span>
<span id="142"> 142</span>
<span id="143"> 143</span>
<span id="144"> 144</span>
<span id="145"> 145</span>
<span id="146"> 146</span>
<span id="147"> 147</span>
<span id="148"> 148</span>
<span id="149"> 149</span>
<span id="150"> 150</span>
<span id="151"> 151</span>
<span id="152"> 152</span>
<span id="153"> 153</span>
<span id="154"> 154</span>
<span id="155"> 155</span>
<span id="156"> 156</span>
<span id="157"> 157</span>
<span id="158"> 158</span>
<span id="159"> 159</span>
<span id="160"> 160</span>
<span id="161"> 161</span>
<span id="162"> 162</span>
<span id="163"> 163</span>
<span id="164"> 164</span>
<span id="165"> 165</span>
<span id="166"> 166</span>
<span id="167"> 167</span>
<span id="168"> 168</span>
<span id="169"> 169</span>
<span id="170"> 170</span>
<span id="171"> 171</span>
<span id="172"> 172</span>
<span id="173"> 173</span>
<span id="174"> 174</span>
<span id="175"> 175</span>
<span id="176"> 176</span>
<span id="177"> 177</span>
<span id="178"> 178</span>
<span id="179"> 179</span>
<span id="180"> 180</span>
<span id="181"> 181</span>
<span id="182"> 182</span>
<span id="183"> 183</span>
<span id="184"> 184</span>
<span id="185"> 185</span>
<span id="186"> 186</span>
<span id="187"> 187</span>
<span id="188"> 188</span>
<span id="189"> 189</span>
<span id="190"> 190</span>
<span id="191"> 191</span>
<span id="192"> 192</span>
<span id="193"> 193</span>
<span id="194"> 194</span>
<span id="195"> 195</span>
<span id="196"> 196</span>
<span id="197"> 197</span>
<span id="198"> 198</span>
<span id="199"> 199</span>
<span id="200"> 200</span>
<span id="201"> 201</span>
<span id="202"> 202</span>
<span id="203"> 203</span>
<span id="204"> 204</span>
<span id="205"> 205</span>
<span id="206"> 206</span>
<span id="207"> 207</span>
<span id="208"> 208</span>
<span id="209"> 209</span>
<span id="210"> 210</span>
<span id="211"> 211</span>
<span id="212"> 212</span>
<span id="213"> 213</span>
<span id="214"> 214</span>
<span id="215"> 215</span>
<span id="216"> 216</span>
<span id="217"> 217</span>
<span id="218"> 218</span>
<span id="219"> 219</span>
<span id="220"> 220</span>
<span id="221"> 221</span>
<span id="222"> 222</span>
<span id="223"> 223</span>
<span id="224"> 224</span>
<span id="225"> 225</span>
<span id="226"> 226</span>
<span id="227"> 227</span>
<span id="228"> 228</span>
<span id="229"> 229</span>
<span id="230"> 230</span>
<span id="231"> 231</span>
<span id="232"> 232</span>
<span id="233"> 233</span>
<span id="234"> 234</span>
<span id="235"> 235</span>
<span id="236"> 236</span>
<span id="237"> 237</span>
<span id="238"> 238</span>
<span id="239"> 239</span>
<span id="240"> 240</span>
<span id="241"> 241</span>
<span id="242"> 242</span>
<span id="243"> 243</span>
<span id="244"> 244</span>
<span id="245"> 245</span>
<span id="246"> 246</span>
<span id="247"> 247</span>
<span id="248"> 248</span>
<span id="249"> 249</span>
<span id="250"> 250</span>
<span id="251"> 251</span>
<span id="252"> 252</span>
<span id="253"> 253</span>
<span id="254"> 254</span>
<span id="255"> 255</span>
<span id="256"> 256</span>
<span id="257"> 257</span>
<span id="258"> 258</span>
<span id="259"> 259</span>
<span id="260"> 260</span>
<span id="261"> 261</span>
<span id="262"> 262</span>
<span id="263"> 263</span>
<span id="264"> 264</span>
<span id="265"> 265</span>
<span id="266"> 266</span>
<span id="267"> 267</span>
<span id="268"> 268</span>
<span id="269"> 269</span>
<span id="270"> 270</span>
<span id="271"> 271</span>
<span id="272"> 272</span>
<span id="273"> 273</span>
<span id="274"> 274</span>
<span id="275"> 275</span>
<span id="276"> 276</span>
<span id="277"> 277</span>
<span id="278"> 278</span>
<span id="279"> 279</span>
<span id="280"> 280</span>
<span id="281"> 281</span>
<span id="282"> 282</span>
<span id="283"> 283</span>
<span id="284"> 284</span>
<span id="285"> 285</span>
<span id="286"> 286</span>
<span id="287"> 287</span>
<span id="288"> 288</span>
<span id="289"> 289</span>
<span id="290"> 290</span>
<span id="291"> 291</span>
<span id="292"> 292</span>
<span id="293"> 293</span>
<span id="294"> 294</span>
<span id="295"> 295</span>
<span id="296"> 296</span>
<span id="297"> 297</span>
<span id="298"> 298</span>
<span id="299"> 299</span>
<span id="300"> 300</span>
<span id="301"> 301</span>
<span id="302"> 302</span>
<span id="303"> 303</span>
<span id="304"> 304</span>
<span id="305"> 305</span>
<span id="306"> 306</span>
<span id="307"> 307</span>
<span id="308"> 308</span>
<span id="309"> 309</span>
<span id="310"> 310</span>
<span id="311"> 311</span>
<span id="312"> 312</span>
<span id="313"> 313</span>
<span id="314"> 314</span>
<span id="315"> 315</span>
<span id="316"> 316</span>
<span id="317"> 317</span>
<span id="318"> 318</span>
<span id="319"> 319</span>
<span id="320"> 320</span>
<span id="321"> 321</span>
<span id="322"> 322</span>
<span id="323"> 323</span>
<span id="324"> 324</span>
<span id="325"> 325</span>
<span id="326"> 326</span>
<span id="327"> 327</span>
<span id="328"> 328</span>
<span id="329"> 329</span>
<span id="330"> 330</span>
<span id="331"> 331</span>
<span id="332"> 332</span>
<span id="333"> 333</span>
<span id="334"> 334</span>
<span id="335"> 335</span>
<span id="336"> 336</span>
<span id="337"> 337</span>
<span id="338"> 338</span>
<span id="339"> 339</span>
<span id="340"> 340</span>
<span id="341"> 341</span>
<span id="342"> 342</span>
<span id="343"> 343</span>
<span id="344"> 344</span>
<span id="345"> 345</span>
<span id="346"> 346</span>
<span id="347"> 347</span>
<span id="348"> 348</span>
<span id="349"> 349</span>
<span id="350"> 350</span>
<span id="351"> 351</span>
<span id="352"> 352</span>
<span id="353"> 353</span>
<span id="354"> 354</span>
<span id="355"> 355</span>
<span id="356"> 356</span>
<span id="357"> 357</span>
<span id="358"> 358</span>
<span id="359"> 359</span>
<span id="360"> 360</span>
<span id="361"> 361</span>
<span id="362"> 362</span>
<span id="363"> 363</span>
<span id="364"> 364</span>
<span id="365"> 365</span>
<span id="366"> 366</span>
<span id="367"> 367</span>
<span id="368"> 368</span>
<span id="369"> 369</span>
<span id="370"> 370</span>
<span id="371"> 371</span>
<span id="372"> 372</span>
<span id="373"> 373</span>
<span id="374"> 374</span>
<span id="375"> 375</span>
<span id="376"> 376</span>
<span id="377"> 377</span>
<span id="378"> 378</span>
<span id="379"> 379</span>
<span id="380"> 380</span>
<span id="381"> 381</span>
<span id="382"> 382</span>
<span id="383"> 383</span>
<span id="384"> 384</span>
<span id="385"> 385</span>
<span id="386"> 386</span>
<span id="387"> 387</span>
<span id="388"> 388</span>
<span id="389"> 389</span>
<span id="390"> 390</span>
<span id="391"> 391</span>
<span id="392"> 392</span>
<span id="393"> 393</span>
<span id="394"> 394</span>
<span id="395"> 395</span>
<span id="396"> 396</span>
<span id="397"> 397</span>
<span id="398"> 398</span>
<span id="399"> 399</span>
<span id="400"> 400</span>
<span id="401"> 401</span>
<span id="402"> 402</span>
<span id="403"> 403</span>
<span id="404"> 404</span>
<span id="405"> 405</span>
<span id="406"> 406</span>
<span id="407"> 407</span>
<span id="408"> 408</span>
<span id="409"> 409</span>
<span id="410"> 410</span>
<span id="411"> 411</span>
<span id="412"> 412</span>
<span id="413"> 413</span>
<span id="414"> 414</span>
<span id="415"> 415</span>
<span id="416"> 416</span>
<span id="417"> 417</span>
<span id="418"> 418</span>
<span id="419"> 419</span>
<span id="420"> 420</span>
<span id="421"> 421</span>
<span id="422"> 422</span>
<span id="423"> 423</span>
<span id="424"> 424</span>
<span id="425"> 425</span>
<span id="426"> 426</span>
<span id="427"> 427</span>
<span id="428"> 428</span>
<span id="429"> 429</span>
<span id="430"> 430</span>
<span id="431"> 431</span>
<span id="432"> 432</span>
<span id="433"> 433</span>
<span id="434"> 434</span>
<span id="435"> 435</span>
<span id="436"> 436</span>
<span id="437"> 437</span>
<span id="438"> 438</span>
<span id="439"> 439</span>
<span id="440"> 440</span>
<span id="441"> 441</span>
<span id="442"> 442</span>
<span id="443"> 443</span>
<span id="444"> 444</span>
<span id="445"> 445</span>
<span id="446"> 446</span>
<span id="447"> 447</span>
<span id="448"> 448</span>
<span id="449"> 449</span>
<span id="450"> 450</span>
<span id="451"> 451</span>
<span id="452"> 452</span>
<span id="453"> 453</span>
<span id="454"> 454</span>
<span id="455"> 455</span>
<span id="456"> 456</span>
<span id="457"> 457</span>
<span id="458"> 458</span>
<span id="459"> 459</span>
<span id="460"> 460</span>
<span id="461"> 461</span>
<span id="462"> 462</span>
<span id="463"> 463</span>
<span id="464"> 464</span>
<span id="465"> 465</span>
<span id="466"> 466</span>
<span id="467"> 467</span>
<span id="468"> 468</span>
<span id="469"> 469</span>
<span id="470"> 470</span>
<span id="471"> 471</span>
<span id="472"> 472</span>
<span id="473"> 473</span>
<span id="474"> 474</span>
<span id="475"> 475</span>
<span id="476"> 476</span>
<span id="477"> 477</span>
<span id="478"> 478</span>
<span id="479"> 479</span>
<span id="480"> 480</span>
<span id="481"> 481</span>
<span id="482"> 482</span>
<span id="483"> 483</span>
<span id="484"> 484</span>
<span id="485"> 485</span>
<span id="486"> 486</span>
<span id="487"> 487</span>
<span id="488"> 488</span>
<span id="489"> 489</span>
<span id="490"> 490</span>
<span id="491"> 491</span>
<span id="492"> 492</span>
<span id="493"> 493</span>
<span id="494"> 494</span>
<span id="495"> 495</span>
<span id="496"> 496</span>
<span id="497"> 497</span>
<span id="498"> 498</span>
<span id="499"> 499</span>
<span id="500"> 500</span>
<span id="501"> 501</span>
<span id="502"> 502</span>
<span id="503"> 503</span>
<span id="504"> 504</span>
<span id="505"> 505</span>
<span id="506"> 506</span>
<span id="507"> 507</span>
<span id="508"> 508</span>
<span id="509"> 509</span>
<span id="510"> 510</span>
<span id="511"> 511</span>
<span id="512"> 512</span>
<span id="513"> 513</span>
<span id="514"> 514</span>
<span id="515"> 515</span>
<span id="516"> 516</span>
<span id="517"> 517</span>
<span id="518"> 518</span>
<span id="519"> 519</span>
<span id="520"> 520</span>
<span id="521"> 521</span>
<span id="522"> 522</span>
<span id="523"> 523</span>
<span id="524"> 524</span>
<span id="525"> 525</span>
<span id="526"> 526</span>
<span id="527"> 527</span>
<span id="528"> 528</span>
<span id="529"> 529</span>
<span id="530"> 530</span>
<span id="531"> 531</span>
<span id="532"> 532</span>
<span id="533"> 533</span>
<span id="534"> 534</span>
<span id="535"> 535</span>
<span id="536"> 536</span>
<span id="537"> 537</span>
<span id="538"> 538</span>
<span id="539"> 539</span>
<span id="540"> 540</span>
<span id="541"> 541</span>
<span id="542"> 542</span>
<span id="543"> 543</span>
<span id="544"> 544</span>
<span id="545"> 545</span>
<span id="546"> 546</span>
<span id="547"> 547</span>
<span id="548"> 548</span>
<span id="549"> 549</span>
<span id="550"> 550</span>
<span id="551"> 551</span>
<span id="552"> 552</span>
<span id="553"> 553</span>
<span id="554"> 554</span>
<span id="555"> 555</span>
<span id="556"> 556</span>
<span id="557"> 557</span>
<span id="558"> 558</span>
<span id="559"> 559</span>
<span id="560"> 560</span>
<span id="561"> 561</span>
<span id="562"> 562</span>
<span id="563"> 563</span>
<span id="564"> 564</span>
<span id="565"> 565</span>
<span id="566"> 566</span>
<span id="567"> 567</span>
<span id="568"> 568</span>
<span id="569"> 569</span>
<span id="570"> 570</span>
<span id="571"> 571</span>
<span id="572"> 572</span>
<span id="573"> 573</span>
<span id="574"> 574</span>
<span id="575"> 575</span>
<span id="576"> 576</span>
<span id="577"> 577</span>
<span id="578"> 578</span>
<span id="579"> 579</span>
<span id="580"> 580</span>
<span id="581"> 581</span>
<span id="582"> 582</span>
<span id="583"> 583</span>
<span id="584"> 584</span>
<span id="585"> 585</span>
<span id="586"> 586</span>
<span id="587"> 587</span>
<span id="588"> 588</span>
<span id="589"> 589</span>
<span id="590"> 590</span>
<span id="591"> 591</span>
<span id="592"> 592</span>
<span id="593"> 593</span>
<span id="594"> 594</span>
<span id="595"> 595</span>
<span id="596"> 596</span>
<span id="597"> 597</span>
<span id="598"> 598</span>
<span id="599"> 599</span>
<span id="600"> 600</span>
<span id="601"> 601</span>
<span id="602"> 602</span>
<span id="603"> 603</span>
<span id="604"> 604</span>
<span id="605"> 605</span>
<span id="606"> 606</span>
<span id="607"> 607</span>
<span id="608"> 608</span>
<span id="609"> 609</span>
<span id="610"> 610</span>
<span id="611"> 611</span>
<span id="612"> 612</span>
<span id="613"> 613</span>
<span id="614"> 614</span>
<span id="615"> 615</span>
<span id="616"> 616</span>
<span id="617"> 617</span>
<span id="618"> 618</span>
<span id="619"> 619</span>
<span id="620"> 620</span>
<span id="621"> 621</span>
<span id="622"> 622</span>
<span id="623"> 623</span>
<span id="624"> 624</span>
<span id="625"> 625</span>
<span id="626"> 626</span>
<span id="627"> 627</span>
<span id="628"> 628</span>
<span id="629"> 629</span>
<span id="630"> 630</span>
<span id="631"> 631</span>
<span id="632"> 632</span>
<span id="633"> 633</span>
<span id="634"> 634</span>
<span id="635"> 635</span>
<span id="636"> 636</span>
<span id="637"> 637</span>
<span id="638"> 638</span>
<span id="639"> 639</span>
<span id="640"> 640</span>
<span id="641"> 641</span>
<span id="642"> 642</span>
<span id="643"> 643</span>
<span id="644"> 644</span>
<span id="645"> 645</span>
<span id="646"> 646</span>
<span id="647"> 647</span>
<span id="648"> 648</span>
<span id="649"> 649</span>
<span id="650"> 650</span>
<span id="651"> 651</span>
<span id="652"> 652</span>
<span id="653"> 653</span>
<span id="654"> 654</span>
<span id="655"> 655</span>
<span id="656"> 656</span>
<span id="657"> 657</span>
<span id="658"> 658</span>
<span id="659"> 659</span>
<span id="660"> 660</span>
<span id="661"> 661</span>
<span id="662"> 662</span>
<span id="663"> 663</span>
<span id="664"> 664</span>
<span id="665"> 665</span>
<span id="666"> 666</span>
<span id="667"> 667</span>
<span id="668"> 668</span>
<span id="669"> 669</span>
<span id="670"> 670</span>
<span id="671"> 671</span>
<span id="672"> 672</span>
<span id="673"> 673</span>
<span id="674"> 674</span>
<span id="675"> 675</span>
<span id="676"> 676</span>
<span id="677"> 677</span>
<span id="678"> 678</span>
<span id="679"> 679</span>
<span id="680"> 680</span>
<span id="681"> 681</span>
<span id="682"> 682</span>
<span id="683"> 683</span>
<span id="684"> 684</span>
<span id="685"> 685</span>
<span id="686"> 686</span>
<span id="687"> 687</span>
<span id="688"> 688</span>
<span id="689"> 689</span>
<span id="690"> 690</span>
<span id="691"> 691</span>
<span id="692"> 692</span>
<span id="693"> 693</span>
<span id="694"> 694</span>
<span id="695"> 695</span>
<span id="696"> 696</span>
<span id="697"> 697</span>
<span id="698"> 698</span>
<span id="699"> 699</span>
<span id="700"> 700</span>
<span id="701"> 701</span>
<span id="702"> 702</span>
<span id="703"> 703</span>
<span id="704"> 704</span>
<span id="705"> 705</span>
<span id="706"> 706</span>
<span id="707"> 707</span>
<span id="708"> 708</span>
<span id="709"> 709</span>
<span id="710"> 710</span>
<span id="711"> 711</span>
<span id="712"> 712</span>
<span id="713"> 713</span>
<span id="714"> 714</span>
<span id="715"> 715</span>
<span id="716"> 716</span>
<span id="717"> 717</span>
<span id="718"> 718</span>
<span id="719"> 719</span>
<span id="720"> 720</span>
<span id="721"> 721</span>
<span id="722"> 722</span>
<span id="723"> 723</span>
<span id="724"> 724</span>
<span id="725"> 725</span>
<span id="726"> 726</span>
<span id="727"> 727</span>
<span id="728"> 728</span>
<span id="729"> 729</span>
<span id="730"> 730</span>
<span id="731"> 731</span>
<span id="732"> 732</span>
<span id="733"> 733</span>
<span id="734"> 734</span>
<span id="735"> 735</span>
<span id="736"> 736</span>
<span id="737"> 737</span>
<span id="738"> 738</span>
<span id="739"> 739</span>
<span id="740"> 740</span>
<span id="741"> 741</span>
<span id="742"> 742</span>
<span id="743"> 743</span>
<span id="744"> 744</span>
<span id="745"> 745</span>
<span id="746"> 746</span>
<span id="747"> 747</span>
<span id="748"> 748</span>
<span id="749"> 749</span>
<span id="750"> 750</span>
<span id="751"> 751</span>
<span id="752"> 752</span>
<span id="753"> 753</span>
<span id="754"> 754</span>
<span id="755"> 755</span>
<span id="756"> 756</span>
<span id="757"> 757</span>
<span id="758"> 758</span>
<span id="759"> 759</span>
<span id="760"> 760</span>
<span id="761"> 761</span>
<span id="762"> 762</span>
<span id="763"> 763</span>
<span id="764"> 764</span>
<span id="765"> 765</span>
<span id="766"> 766</span>
<span id="767"> 767</span>
<span id="768"> 768</span>
<span id="769"> 769</span>
<span id="770"> 770</span>
<span id="771"> 771</span>
<span id="772"> 772</span>
<span id="773"> 773</span>
<span id="774"> 774</span>
<span id="775"> 775</span>
<span id="776"> 776</span>
<span id="777"> 777</span>
<span id="778"> 778</span>
<span id="779"> 779</span>
<span id="780"> 780</span>
<span id="781"> 781</span>
<span id="782"> 782</span>
<span id="783"> 783</span>
<span id="784"> 784</span>
<span id="785"> 785</span>
<span id="786"> 786</span>
<span id="787"> 787</span>
<span id="788"> 788</span>
<span id="789"> 789</span>
<span id="790"> 790</span>
<span id="791"> 791</span>
<span id="792"> 792</span>
<span id="793"> 793</span>
<span id="794"> 794</span>
<span id="795"> 795</span>
<span id="796"> 796</span>
<span id="797"> 797</span>
<span id="798"> 798</span>
<span id="799"> 799</span>
<span id="800"> 800</span>
<span id="801"> 801</span>
<span id="802"> 802</span>
<span id="803"> 803</span>
<span id="804"> 804</span>
<span id="805"> 805</span>
<span id="806"> 806</span>
<span id="807"> 807</span>
<span id="808"> 808</span>
<span id="809"> 809</span>
<span id="810"> 810</span>
<span id="811"> 811</span>
<span id="812"> 812</span>
<span id="813"> 813</span>
<span id="814"> 814</span>
<span id="815"> 815</span>
<span id="816"> 816</span>
<span id="817"> 817</span>
<span id="818"> 818</span>
<span id="819"> 819</span>
<span id="820"> 820</span>
<span id="821"> 821</span>
<span id="822"> 822</span>
<span id="823"> 823</span>
<span id="824"> 824</span>
<span id="825"> 825</span>
<span id="826"> 826</span>
<span id="827"> 827</span>
<span id="828"> 828</span>
<span id="829"> 829</span>
<span id="830"> 830</span>
<span id="831"> 831</span>
<span id="832"> 832</span>
<span id="833"> 833</span>
<span id="834"> 834</span>
<span id="835"> 835</span>
<span id="836"> 836</span>
<span id="837"> 837</span>
<span id="838"> 838</span>
<span id="839"> 839</span>
<span id="840"> 840</span>
<span id="841"> 841</span>
<span id="842"> 842</span>
<span id="843"> 843</span>
<span id="844"> 844</span>
<span id="845"> 845</span>
<span id="846"> 846</span>
<span id="847"> 847</span>
<span id="848"> 848</span>
<span id="849"> 849</span>
<span id="850"> 850</span>
<span id="851"> 851</span>
<span id="852"> 852</span>
<span id="853"> 853</span>
<span id="854"> 854</span>
<span id="855"> 855</span>
<span id="856"> 856</span>
<span id="857"> 857</span>
<span id="858"> 858</span>
<span id="859"> 859</span>
<span id="860"> 860</span>
<span id="861"> 861</span>
<span id="862"> 862</span>
<span id="863"> 863</span>
<span id="864"> 864</span>
<span id="865"> 865</span>
<span id="866"> 866</span>
<span id="867"> 867</span>
<span id="868"> 868</span>
<span id="869"> 869</span>
<span id="870"> 870</span>
<span id="871"> 871</span>
<span id="872"> 872</span>
<span id="873"> 873</span>
<span id="874"> 874</span>
<span id="875"> 875</span>
<span id="876"> 876</span>
<span id="877"> 877</span>
<span id="878"> 878</span>
<span id="879"> 879</span>
<span id="880"> 880</span>
<span id="881"> 881</span>
<span id="882"> 882</span>
<span id="883"> 883</span>
<span id="884"> 884</span>
<span id="885"> 885</span>
<span id="886"> 886</span>
<span id="887"> 887</span>
<span id="888"> 888</span>
<span id="889"> 889</span>
<span id="890"> 890</span>
<span id="891"> 891</span>
<span id="892"> 892</span>
<span id="893"> 893</span>
<span id="894"> 894</span>
<span id="895"> 895</span>
<span id="896"> 896</span>
<span id="897"> 897</span>
<span id="898"> 898</span>
<span id="899"> 899</span>
<span id="900"> 900</span>
<span id="901"> 901</span>
<span id="902"> 902</span>
<span id="903"> 903</span>
<span id="904"> 904</span>
<span id="905"> 905</span>
<span id="906"> 906</span>
<span id="907"> 907</span>
<span id="908"> 908</span>
<span id="909"> 909</span>
<span id="910"> 910</span>
<span id="911"> 911</span>
<span id="912"> 912</span>
<span id="913"> 913</span>
<span id="914"> 914</span>
<span id="915"> 915</span>
<span id="916"> 916</span>
<span id="917"> 917</span>
<span id="918"> 918</span>
<span id="919"> 919</span>
<span id="920"> 920</span>
<span id="921"> 921</span>
<span id="922"> 922</span>
<span id="923"> 923</span>
<span id="924"> 924</span>
<span id="925"> 925</span>
<span id="926"> 926</span>
<span id="927"> 927</span>
<span id="928"> 928</span>
<span id="929"> 929</span>
<span id="930"> 930</span>
<span id="931"> 931</span>
<span id="932"> 932</span>
<span id="933"> 933</span>
<span id="934"> 934</span>
<span id="935"> 935</span>
<span id="936"> 936</span>
<span id="937"> 937</span>
<span id="938"> 938</span>
<span id="939"> 939</span>
<span id="940"> 940</span>
<span id="941"> 941</span>
<span id="942"> 942</span>
<span id="943"> 943</span>
<span id="944"> 944</span>
<span id="945"> 945</span>
<span id="946"> 946</span>
<span id="947"> 947</span>
<span id="948"> 948</span>
<span id="949"> 949</span>
<span id="950"> 950</span>
<span id="951"> 951</span>
<span id="952"> 952</span>
<span id="953"> 953</span>
<span id="954"> 954</span>
<span id="955"> 955</span>
<span id="956"> 956</span>
<span id="957"> 957</span>
<span id="958"> 958</span>
<span id="959"> 959</span>
<span id="960"> 960</span>
<span id="961"> 961</span>
<span id="962"> 962</span>
<span id="963"> 963</span>
<span id="964"> 964</span>
<span id="965"> 965</span>
<span id="966"> 966</span>
<span id="967"> 967</span>
<span id="968"> 968</span>
<span id="969"> 969</span>
<span id="970"> 970</span>
<span id="971"> 971</span>
<span id="972"> 972</span>
<span id="973"> 973</span>
<span id="974"> 974</span>
<span id="975"> 975</span>
<span id="976"> 976</span>
<span id="977"> 977</span>
<span id="978"> 978</span>
<span id="979"> 979</span>
<span id="980"> 980</span>
<span id="981"> 981</span>
<span id="982"> 982</span>
<span id="983"> 983</span>
<span id="984"> 984</span>
<span id="985"> 985</span>
<span id="986"> 986</span>
<span id="987"> 987</span>
<span id="988"> 988</span>
<span id="989"> 989</span>
<span id="990"> 990</span>
<span id="991"> 991</span>
<span id="992"> 992</span>
<span id="993"> 993</span>
<span id="994"> 994</span>
<span id="995"> 995</span>
<span id="996"> 996</span>
<span id="997"> 997</span>
<span id="998"> 998</span>
<span id="999"> 999</span>
<span id="1000">1000</span>
<span id="1001">1001</span>
<span id="1002">1002</span>
<span id="1003">1003</span>
<span id="1004">1004</span>
<span id="1005">1005</span>
<span id="1006">1006</span>
<span id="1007">1007</span>
<span id="1008">1008</span>
<span id="1009">1009</span>
<span id="1010">1010</span>
<span id="1011">1011</span>
<span id="1012">1012</span>
<span id="1013">1013</span>
<span id="1014">1014</span>
<span id="1015">1015</span>
<span id="1016">1016</span>
<span id="1017">1017</span>
<span id="1018">1018</span>
<span id="1019">1019</span>
<span id="1020">1020</span>
<span id="1021">1021</span>
<span id="1022">1022</span>
<span id="1023">1023</span>
<span id="1024">1024</span>
<span id="1025">1025</span>
<span id="1026">1026</span>
<span id="1027">1027</span>
<span id="1028">1028</span>
<span id="1029">1029</span>
<span id="1030">1030</span>
<span id="1031">1031</span>
<span id="1032">1032</span>
<span id="1033">1033</span>
<span id="1034">1034</span>
<span id="1035">1035</span>
<span id="1036">1036</span>
<span id="1037">1037</span>
<span id="1038">1038</span>
<span id="1039">1039</span>
</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Servo Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! A [DEFLATE](http://www.gzip.org/zlib/rfc-deflate.html) decoder written in rust.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This library provides functionality to decompress data compressed with the DEFLATE algorithm,</span>
<span class="doccomment">//! both with and without a [zlib](https://tools.ietf.org/html/rfc1950) header/trailer.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples</span>
<span class="doccomment">//! The easiest way to get `std::Vec<u8>` containing the decompressed bytes is to use either</span>
<span class="doccomment">//! `inflate::inflate_bytes` or `inflate::inflate_bytes_zlib` (depending on whether</span>
<span class="doccomment">//! the encoded data has zlib headers and trailers or not). The following example</span>
<span class="doccomment">//! decodes the DEFLATE encoded string "Hello, world" and prints it:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! use inflate::inflate_bytes;</span>
<span class="doccomment">//! use std::str::from_utf8;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let encoded = [243, 72, 205, 201, 201, 215, 81, 40, 207, 47, 202, 73, 1, 0];</span>
<span class="doccomment">//! let decoded = inflate_bytes(&encoded).unwrap();</span>
<span class="doccomment">//! println!("{}", from_utf8(&decoded).unwrap()); // prints "Hello, world"</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! If you need more flexibility, then the library also provides an implementation</span>
<span class="doccomment">//! of `std::io::Writer` in `inflate::writer`. Below is an example using an</span>
<span class="doccomment">//! `inflate::writer::InflateWriter` to decode the DEFLATE encoded string "Hello, world":</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! use inflate::InflateWriter;</span>
<span class="doccomment">//! use std::io::Write;</span>
<span class="doccomment">//! use std::str::from_utf8;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let encoded = [243, 72, 205, 201, 201, 215, 81, 40, 207, 47, 202, 73, 1, 0];</span>
<span class="doccomment">//! let mut decoder = InflateWriter::new(Vec::new());</span>
<span class="doccomment">//! decoder.write(&encoded).unwrap();</span>
<span class="doccomment">//! let decoded = decoder.finish().unwrap();</span>
<span class="doccomment">//! println!("{}", from_utf8(&decoded).unwrap()); // prints "Hello, world"</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Finally, if you need even more flexibility, or if you only want to depend on</span>
<span class="doccomment">//! `core`, you can use the `inflate::InflateStream` API. The below example</span>
<span class="doccomment">//! decodes an array of DEFLATE encoded bytes:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! use inflate::InflateStream;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let data = [0x73, 0x49, 0x4d, 0xcb, 0x49, 0x2c, 0x49, 0x55, 0x00, 0x11, 0x00];</span>
<span class="doccomment">//! let mut inflater = InflateStream::new();</span>
<span class="doccomment">//! let mut out = Vec::<u8>::new();</span>
<span class="doccomment">//! let mut n = 0;</span>
<span class="doccomment">//! while n < data.len() {</span>
<span class="doccomment">//! let res = inflater.update(&data[n..]);</span>
<span class="doccomment">//! if let Ok((num_bytes_read, result)) = res {</span>
<span class="doccomment">//! n += num_bytes_read;</span>
<span class="doccomment">//! out.extend(result.iter().cloned());</span>
<span class="doccomment">//! } else {</span>
<span class="doccomment">//! res.unwrap();</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">adler32</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</span>;
<span class="kw">mod</span> <span class="ident">checksum</span>;
<span class="kw">use</span> <span class="ident">checksum</span>::{<span class="ident">Checksum</span>, <span class="ident">adler32_from_bytes</span>};
<span class="kw">mod</span> <span class="ident">writer</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">writer</span>::{<span class="ident">InflateWriter</span>};
<span class="kw">mod</span> <span class="ident">utils</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">utils</span>::{<span class="ident">inflate_bytes</span>, <span class="ident">inflate_bytes_zlib</span>, <span class="ident">inflate_bytes_zlib_no_checksum</span>};
<span class="kw">mod</span> <span class="ident">reader</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">reader</span>::{<span class="ident">DeflateDecoder</span>, <span class="ident">DeflateDecoderBuf</span>};
<span class="kw">static</span> <span class="ident">BIT_REV_U8</span>: [<span class="ident">u8</span>; <span class="number">256</span>] <span class="op">=</span> [
<span class="number">0b0000_0000</span>, <span class="number">0b1000_0000</span>, <span class="number">0b0100_0000</span>, <span class="number">0b1100_0000</span>,
<span class="number">0b0010_0000</span>, <span class="number">0b1010_0000</span>, <span class="number">0b0110_0000</span>, <span class="number">0b1110_0000</span>,
<span class="number">0b0001_0000</span>, <span class="number">0b1001_0000</span>, <span class="number">0b0101_0000</span>, <span class="number">0b1101_0000</span>,
<span class="number">0b0011_0000</span>, <span class="number">0b1011_0000</span>, <span class="number">0b0111_0000</span>, <span class="number">0b1111_0000</span>,
<span class="number">0b0000_1000</span>, <span class="number">0b1000_1000</span>, <span class="number">0b0100_1000</span>, <span class="number">0b1100_1000</span>,
<span class="number">0b0010_1000</span>, <span class="number">0b1010_1000</span>, <span class="number">0b0110_1000</span>, <span class="number">0b1110_1000</span>,
<span class="number">0b0001_1000</span>, <span class="number">0b1001_1000</span>, <span class="number">0b0101_1000</span>, <span class="number">0b1101_1000</span>,
<span class="number">0b0011_1000</span>, <span class="number">0b1011_1000</span>, <span class="number">0b0111_1000</span>, <span class="number">0b1111_1000</span>,
<span class="number">0b0000_0100</span>, <span class="number">0b1000_0100</span>, <span class="number">0b0100_0100</span>, <span class="number">0b1100_0100</span>,
<span class="number">0b0010_0100</span>, <span class="number">0b1010_0100</span>, <span class="number">0b0110_0100</span>, <span class="number">0b1110_0100</span>,
<span class="number">0b0001_0100</span>, <span class="number">0b1001_0100</span>, <span class="number">0b0101_0100</span>, <span class="number">0b1101_0100</span>,
<span class="number">0b0011_0100</span>, <span class="number">0b1011_0100</span>, <span class="number">0b0111_0100</span>, <span class="number">0b1111_0100</span>,
<span class="number">0b0000_1100</span>, <span class="number">0b1000_1100</span>, <span class="number">0b0100_1100</span>, <span class="number">0b1100_1100</span>,
<span class="number">0b0010_1100</span>, <span class="number">0b1010_1100</span>, <span class="number">0b0110_1100</span>, <span class="number">0b1110_1100</span>,
<span class="number">0b0001_1100</span>, <span class="number">0b1001_1100</span>, <span class="number">0b0101_1100</span>, <span class="number">0b1101_1100</span>,
<span class="number">0b0011_1100</span>, <span class="number">0b1011_1100</span>, <span class="number">0b0111_1100</span>, <span class="number">0b1111_1100</span>,
<span class="number">0b0000_0010</span>, <span class="number">0b1000_0010</span>, <span class="number">0b0100_0010</span>, <span class="number">0b1100_0010</span>,
<span class="number">0b0010_0010</span>, <span class="number">0b1010_0010</span>, <span class="number">0b0110_0010</span>, <span class="number">0b1110_0010</span>,
<span class="number">0b0001_0010</span>, <span class="number">0b1001_0010</span>, <span class="number">0b0101_0010</span>, <span class="number">0b1101_0010</span>,
<span class="number">0b0011_0010</span>, <span class="number">0b1011_0010</span>, <span class="number">0b0111_0010</span>, <span class="number">0b1111_0010</span>,
<span class="number">0b0000_1010</span>, <span class="number">0b1000_1010</span>, <span class="number">0b0100_1010</span>, <span class="number">0b1100_1010</span>,
<span class="number">0b0010_1010</span>, <span class="number">0b1010_1010</span>, <span class="number">0b0110_1010</span>, <span class="number">0b1110_1010</span>,
<span class="number">0b0001_1010</span>, <span class="number">0b1001_1010</span>, <span class="number">0b0101_1010</span>, <span class="number">0b1101_1010</span>,
<span class="number">0b0011_1010</span>, <span class="number">0b1011_1010</span>, <span class="number">0b0111_1010</span>, <span class="number">0b1111_1010</span>,
<span class="number">0b0000_0110</span>, <span class="number">0b1000_0110</span>, <span class="number">0b0100_0110</span>, <span class="number">0b1100_0110</span>,
<span class="number">0b0010_0110</span>, <span class="number">0b1010_0110</span>, <span class="number">0b0110_0110</span>, <span class="number">0b1110_0110</span>,
<span class="number">0b0001_0110</span>, <span class="number">0b1001_0110</span>, <span class="number">0b0101_0110</span>, <span class="number">0b1101_0110</span>,
<span class="number">0b0011_0110</span>, <span class="number">0b1011_0110</span>, <span class="number">0b0111_0110</span>, <span class="number">0b1111_0110</span>,
<span class="number">0b0000_1110</span>, <span class="number">0b1000_1110</span>, <span class="number">0b0100_1110</span>, <span class="number">0b1100_1110</span>,
<span class="number">0b0010_1110</span>, <span class="number">0b1010_1110</span>, <span class="number">0b0110_1110</span>, <span class="number">0b1110_1110</span>,
<span class="number">0b0001_1110</span>, <span class="number">0b1001_1110</span>, <span class="number">0b0101_1110</span>, <span class="number">0b1101_1110</span>,
<span class="number">0b0011_1110</span>, <span class="number">0b1011_1110</span>, <span class="number">0b0111_1110</span>, <span class="number">0b1111_1110</span>,
<span class="number">0b0000_0001</span>, <span class="number">0b1000_0001</span>, <span class="number">0b0100_0001</span>, <span class="number">0b1100_0001</span>,
<span class="number">0b0010_0001</span>, <span class="number">0b1010_0001</span>, <span class="number">0b0110_0001</span>, <span class="number">0b1110_0001</span>,
<span class="number">0b0001_0001</span>, <span class="number">0b1001_0001</span>, <span class="number">0b0101_0001</span>, <span class="number">0b1101_0001</span>,
<span class="number">0b0011_0001</span>, <span class="number">0b1011_0001</span>, <span class="number">0b0111_0001</span>, <span class="number">0b1111_0001</span>,
<span class="number">0b0000_1001</span>, <span class="number">0b1000_1001</span>, <span class="number">0b0100_1001</span>, <span class="number">0b1100_1001</span>,
<span class="number">0b0010_1001</span>, <span class="number">0b1010_1001</span>, <span class="number">0b0110_1001</span>, <span class="number">0b1110_1001</span>,
<span class="number">0b0001_1001</span>, <span class="number">0b1001_1001</span>, <span class="number">0b0101_1001</span>, <span class="number">0b1101_1001</span>,
<span class="number">0b0011_1001</span>, <span class="number">0b1011_1001</span>, <span class="number">0b0111_1001</span>, <span class="number">0b1111_1001</span>,
<span class="number">0b0000_0101</span>, <span class="number">0b1000_0101</span>, <span class="number">0b0100_0101</span>, <span class="number">0b1100_0101</span>,
<span class="number">0b0010_0101</span>, <span class="number">0b1010_0101</span>, <span class="number">0b0110_0101</span>, <span class="number">0b1110_0101</span>,
<span class="number">0b0001_0101</span>, <span class="number">0b1001_0101</span>, <span class="number">0b0101_0101</span>, <span class="number">0b1101_0101</span>,
<span class="number">0b0011_0101</span>, <span class="number">0b1011_0101</span>, <span class="number">0b0111_0101</span>, <span class="number">0b1111_0101</span>,
<span class="number">0b0000_1101</span>, <span class="number">0b1000_1101</span>, <span class="number">0b0100_1101</span>, <span class="number">0b1100_1101</span>,
<span class="number">0b0010_1101</span>, <span class="number">0b1010_1101</span>, <span class="number">0b0110_1101</span>, <span class="number">0b1110_1101</span>,
<span class="number">0b0001_1101</span>, <span class="number">0b1001_1101</span>, <span class="number">0b0101_1101</span>, <span class="number">0b1101_1101</span>,
<span class="number">0b0011_1101</span>, <span class="number">0b1011_1101</span>, <span class="number">0b0111_1101</span>, <span class="number">0b1111_1101</span>,
<span class="number">0b0000_0011</span>, <span class="number">0b1000_0011</span>, <span class="number">0b0100_0011</span>, <span class="number">0b1100_0011</span>,
<span class="number">0b0010_0011</span>, <span class="number">0b1010_0011</span>, <span class="number">0b0110_0011</span>, <span class="number">0b1110_0011</span>,
<span class="number">0b0001_0011</span>, <span class="number">0b1001_0011</span>, <span class="number">0b0101_0011</span>, <span class="number">0b1101_0011</span>,
<span class="number">0b0011_0011</span>, <span class="number">0b1011_0011</span>, <span class="number">0b0111_0011</span>, <span class="number">0b1111_0011</span>,
<span class="number">0b0000_1011</span>, <span class="number">0b1000_1011</span>, <span class="number">0b0100_1011</span>, <span class="number">0b1100_1011</span>,
<span class="number">0b0010_1011</span>, <span class="number">0b1010_1011</span>, <span class="number">0b0110_1011</span>, <span class="number">0b1110_1011</span>,
<span class="number">0b0001_1011</span>, <span class="number">0b1001_1011</span>, <span class="number">0b0101_1011</span>, <span class="number">0b1101_1011</span>,
<span class="number">0b0011_1011</span>, <span class="number">0b1011_1011</span>, <span class="number">0b0111_1011</span>, <span class="number">0b1111_1011</span>,
<span class="number">0b0000_0111</span>, <span class="number">0b1000_0111</span>, <span class="number">0b0100_0111</span>, <span class="number">0b1100_0111</span>,
<span class="number">0b0010_0111</span>, <span class="number">0b1010_0111</span>, <span class="number">0b0110_0111</span>, <span class="number">0b1110_0111</span>,
<span class="number">0b0001_0111</span>, <span class="number">0b1001_0111</span>, <span class="number">0b0101_0111</span>, <span class="number">0b1101_0111</span>,
<span class="number">0b0011_0111</span>, <span class="number">0b1011_0111</span>, <span class="number">0b0111_0111</span>, <span class="number">0b1111_0111</span>,
<span class="number">0b0000_1111</span>, <span class="number">0b1000_1111</span>, <span class="number">0b0100_1111</span>, <span class="number">0b1100_1111</span>,
<span class="number">0b0010_1111</span>, <span class="number">0b1010_1111</span>, <span class="number">0b0110_1111</span>, <span class="number">0b1110_1111</span>,
<span class="number">0b0001_1111</span>, <span class="number">0b1001_1111</span>, <span class="number">0b0101_1111</span>, <span class="number">0b1101_1111</span>,
<span class="number">0b0011_1111</span>, <span class="number">0b1011_1111</span>, <span class="number">0b0111_1111</span>, <span class="number">0b1111_1111</span>
];
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>)]</span>
<span class="kw">struct</span> <span class="ident">BitState</span> {
<span class="ident">n</span>: <span class="ident">u8</span>,
<span class="ident">v</span>: <span class="ident">u32</span>,
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">struct</span> <span class="ident">BitStream</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">bytes</span>: <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">u8</span><span class="op">></span>,
<span class="ident">used</span>: <span class="ident">usize</span>,
<span class="ident">state</span>: <span class="ident">BitState</span>,
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">debug</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">println</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>)<span class="kw-2">*</span>)) }
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">debug</span>))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">debug</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> (()) }
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">BitStream</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">bytes</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>], <span class="ident">state</span>: <span class="ident">BitState</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BitStream</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">BitStream</span> {
<span class="ident">bytes</span>: <span class="ident">bytes</span>.<span class="ident">iter</span>(),
<span class="ident">used</span>: <span class="number">0</span>,
<span class="ident">state</span>: <span class="ident">state</span>,
}
}
<span class="kw">fn</span> <span class="ident">use_byte</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">bytes</span>.<span class="ident">next</span>() {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">b</span>) <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">|</span><span class="op">=</span> (<span class="ident">b</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><</span><span class="op"><</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span>;
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">+</span><span class="op">=</span> <span class="number">8</span>;
<span class="self">self</span>.<span class="ident">used</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="bool-val">true</span>
}
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">false</span>,
}
}
<span class="kw">fn</span> <span class="ident">need</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">u8</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op"><</span> <span class="ident">n</span> {
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">use_byte</span>() {
<span class="kw">return</span> <span class="bool-val">false</span>;
}
<span class="kw">if</span> <span class="ident">n</span> <span class="op">></span> <span class="number">8</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op"><</span> <span class="ident">n</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">n</span> <span class="op"><</span><span class="op">=</span> <span class="number">16</span>);
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">use_byte</span>() {
<span class="kw">return</span> <span class="bool-val">false</span>;
}
}
}
<span class="bool-val">true</span>
}
<span class="kw">fn</span> <span class="ident">take16</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">u8</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">need</span>(<span class="ident">n</span>) {
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">-</span><span class="op">=</span> <span class="ident">n</span>;
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">&</span> ((<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">n</span>) <span class="op">-</span> <span class="number">1</span>);
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="ident">n</span>;
<span class="prelude-val">Some</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">u16</span>)
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="kw">fn</span> <span class="ident">take</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">u8</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">n</span> <span class="op"><</span><span class="op">=</span> <span class="number">8</span>);
<span class="self">self</span>.<span class="ident">take16</span>(<span class="ident">n</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span>: <span class="ident">u16</span><span class="op">|</span> <span class="ident">v</span> <span class="kw">as</span> <span class="ident">u8</span>)
}
<span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BitState</span> {
<span class="kw">while</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">+</span> <span class="number">8</span> <span class="op"><</span><span class="op">=</span> <span class="number">32</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">use_byte</span>() {}
<span class="self">self</span>.<span class="ident">state</span>
}
<span class="kw">fn</span> <span class="ident">align_byte</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">></span> <span class="number">0</span> {
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">%</span> <span class="number">8</span>;
<span class="self">self</span>.<span class="ident">take</span>(<span class="ident">n</span>);
}
}
<span class="kw">fn</span> <span class="ident">trailing_bytes</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">u8</span>, [<span class="ident">u8</span>; <span class="number">4</span>]) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">len</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">4</span>];
<span class="self">self</span>.<span class="ident">align_byte</span>();
<span class="kw">while</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">></span><span class="op">=</span> <span class="number">8</span> {
<span class="ident">bytes</span>[<span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="kw">as</span> <span class="ident">u8</span>;
<span class="ident">len</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">-</span><span class="op">=</span> <span class="number">8</span>;
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="number">8</span>;
}
(<span class="ident">len</span>, <span class="ident">bytes</span>)
}
}
<span class="doccomment">/// Generate huffman codes from the given set of lengths and run `$cb` on them except the first</span>
<span class="doccomment">/// code for each length.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See also the [deflate specification](http://www.gzip.org/zlib/rfc-deflate.html#huffman)</span>
<span class="doccomment">/// for an explanation of the algorithm.</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">with_codes</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">clens</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">max_bits</span>:<span class="ident">expr</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code_ty</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">cb</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> ({
<span class="comment">// Count the number of codes for each bit length.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bl_count</span> <span class="op">=</span> [<span class="number">0</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code_ty</span>; (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">max_bits</span><span class="op">+</span><span class="number">1</span>)];
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">bits</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">clens</span>.<span class="ident">iter</span>() {
<span class="kw">if</span> <span class="ident">bits</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
<span class="comment">// This should be safe from overflow as the number of lengths read from the input</span>
<span class="comment">// is bounded by the number of bits the number of lengths is represented by in the</span>
<span class="comment">// deflate compressed data.</span>
<span class="ident">bl_count</span>[<span class="ident">bits</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
}
<span class="comment">// Compute the first code value for each bit length.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">next_code</span> <span class="op">=</span> [<span class="number">0</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code_ty</span>; (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">max_bits</span><span class="op">+</span><span class="number">1</span>)];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">code</span> <span class="op">=</span> <span class="number">0</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code_ty</span>;
<span class="comment">// TODO use range_inclusive as soon as it is stable</span>
<span class="comment">//for bits in range_inclusive(1, $max_bits) {</span>
<span class="kw">for</span> <span class="ident">bits</span> <span class="kw">in</span> <span class="number">1</span>..<span class="macro-nonterminal">$</span><span class="macro-nonterminal">max_bits</span> <span class="op">+</span> <span class="number">1</span> {
<span class="ident">code</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(
<span class="ident">code</span>.<span class="ident">checked_add</span>(<span class="ident">bl_count</span>[<span class="ident">bits</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="number">1</span>])
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="string">"Error generating huffman codes: Invalid set of code lengths"</span>)
) <span class="op"><</span><span class="op"><</span> <span class="number">1</span>;
<span class="ident">next_code</span>[<span class="ident">bits</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">code</span>;
}
<span class="comment">// Compute the rest of the codes</span>
<span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&</span><span class="ident">bits</span>) <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">clens</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">if</span> <span class="ident">bits</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="ident">next_code</span>[<span class="ident">bits</span> <span class="kw">as</span> <span class="ident">usize</span>];
<span class="comment">// If there is an overflow here, the given set of code lengths won't allow enough</span>
<span class="comment">// unique codes to be generated.</span>
<span class="kw">let</span> <span class="ident">new_code</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(
<span class="ident">code</span>.<span class="ident">checked_add</span>(<span class="number">1</span>)
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="string">"Error generating huffman codes: Invalid set of code lengths!"</span>)
);
<span class="ident">next_code</span>[<span class="ident">bits</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">new_code</span>;
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">cb</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code_ty</span>, <span class="ident">code</span>, <span class="ident">bits</span>) {
<span class="prelude-val">Ok</span>(()) <span class="op">=</span><span class="op">></span> (),
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>)
}
}
}
}));
<span class="kw">struct</span> <span class="ident">CodeLengthReader</span> {
<span class="ident">patterns</span>: <span class="ident">Box</span><span class="op"><</span>[<span class="ident">u8</span>; <span class="number">128</span>]<span class="op">></span>,
<span class="ident">clens</span>: <span class="ident">Box</span><span class="op"><</span>[<span class="ident">u8</span>; <span class="number">19</span>]<span class="op">></span>,
<span class="ident">result</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="ident">num_lit</span>: <span class="ident">u16</span>,
<span class="ident">num_dist</span>: <span class="ident">u8</span>,
}
<span class="kw">impl</span> <span class="ident">CodeLengthReader</span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">clens</span>: <span class="ident">Box</span><span class="op"><</span>[<span class="ident">u8</span>; <span class="number">19</span>]<span class="op">></span>, <span class="ident">num_lit</span>: <span class="ident">u16</span>, <span class="ident">num_dist</span>: <span class="ident">u8</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">CodeLengthReader</span>, <span class="ident">String</span><span class="op">></span> {
<span class="comment">// Fill in the 7-bit patterns that match each code.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">patterns</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>([<span class="number">0xffu8</span>; <span class="number">128</span>]);
<span class="macro">with_codes</span><span class="macro">!</span>(<span class="ident">clens</span>, <span class="number">7</span> <span class="op">=</span><span class="op">></span> <span class="ident">u8</span>, <span class="op">|</span><span class="ident">i</span>: <span class="ident">u8</span>, <span class="ident">code</span>: <span class="ident">u8</span>, <span class="ident">bits</span><span class="op">|</span> <span class="op">-</span><span class="op">></span> <span class="kw">_</span> {
<span class="comment">/*let base = match BIT_REV_U8.get((code << (8 - bits)) as usize) {
Some(&base) => base,
None => return Err("invalid length code".to_owned())
}*/</span>
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="ident">BIT_REV_U8</span>[(<span class="ident">code</span> <span class="op"><</span><span class="op"><</span> (<span class="number">8</span> <span class="op">-</span> <span class="ident">bits</span>)) <span class="kw">as</span> <span class="ident">usize</span>];
<span class="kw">for</span> <span class="ident">rest</span> <span class="kw">in</span> <span class="number">0u8</span> .. <span class="number">1u8</span> <span class="op"><</span><span class="op"><</span> (<span class="number">7</span> <span class="op">-</span> <span class="ident">bits</span>) {
<span class="ident">patterns</span>[(<span class="ident">base</span> <span class="op">|</span> (<span class="ident">rest</span> <span class="op"><</span><span class="op"><</span> <span class="ident">bits</span>)) <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">i</span>;
}
<span class="prelude-val">Ok</span>(())
});
<span class="prelude-val">Ok</span>(<span class="ident">CodeLengthReader</span> {
<span class="ident">patterns</span>: <span class="ident">patterns</span>,
<span class="ident">clens</span>: <span class="ident">clens</span>,
<span class="ident">result</span>: <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">num_lit</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="ident">num_dist</span> <span class="kw">as</span> <span class="ident">usize</span>),
<span class="ident">num_lit</span>: <span class="ident">num_lit</span>,
<span class="ident">num_dist</span>: <span class="ident">num_dist</span>,
})
}
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">stream</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">BitStream</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">bool</span>, <span class="ident">String</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">total_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_lit</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">num_dist</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">while</span> <span class="self">self</span>.<span class="ident">result</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">total_len</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">stream</span>.<span class="ident">need</span>(<span class="number">7</span>) {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="bool-val">false</span>);
}
<span class="kw">let</span> <span class="ident">save</span> <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">clone</span>();
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">take</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="kw">match</span> <span class="ident">stream</span>.<span class="ident">take</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>) {
<span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="kw-2">*</span><span class="ident">stream</span> <span class="op">=</span> <span class="ident">save</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="bool-val">false</span>);
}
}));
<span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">patterns</span>[(<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">&</span> <span class="number">0x7f</span>) <span class="kw">as</span> <span class="ident">usize</span>];
<span class="ident">stream</span>.<span class="ident">take</span>(<span class="kw">match</span> <span class="self">self</span>.<span class="ident">clens</span>.<span class="ident">get</span>(<span class="ident">code</span> <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">len</span>) <span class="op">=</span><span class="op">></span> <span class="ident">len</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid length code"</span>.<span class="ident">to_owned</span>()),
});
<span class="kw">match</span> <span class="ident">code</span> {
<span class="number">0</span>...<span class="number">15</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">result</span>.<span class="ident">push</span>(<span class="ident">code</span>),
<span class="number">16</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">last</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">result</span>.<span class="ident">last</span>() {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="comment">// 16 appeared before anything else</span>
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid length code"</span>.<span class="ident">to_owned</span>()),
};
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">3</span> <span class="op">+</span> <span class="macro">take</span><span class="macro">!</span>(<span class="number">2</span>) {
<span class="self">self</span>.<span class="ident">result</span>.<span class="ident">push</span>(<span class="ident">last</span>);
}
}
<span class="number">17</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">3</span> <span class="op">+</span> <span class="macro">take</span><span class="macro">!</span>(<span class="number">3</span>) {
<span class="self">self</span>.<span class="ident">result</span>.<span class="ident">push</span>(<span class="number">0</span>);
}
}
<span class="number">18</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">11</span> <span class="op">+</span> <span class="macro">take</span><span class="macro">!</span>(<span class="number">7</span>) {
<span class="self">self</span>.<span class="ident">result</span>.<span class="ident">push</span>(<span class="number">0</span>);
}
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
}
}
<span class="prelude-val">Ok</span>(<span class="bool-val">true</span>)
}
<span class="kw">fn</span> <span class="ident">to_lit_and_dist</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">DynHuffman16</span>, <span class="ident">DynHuffman16</span>), <span class="ident">String</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">num_lit</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_lit</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">lit</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">DynHuffman16</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">result</span>[..<span class="ident">num_lit</span>]));
<span class="kw">let</span> <span class="ident">dist</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">DynHuffman16</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">result</span>[<span class="ident">num_lit</span>..]));
<span class="prelude-val">Ok</span>((<span class="ident">lit</span>, <span class="ident">dist</span>))
}
}
<span class="kw">struct</span> <span class="ident">Trie8bit</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">data</span>: [<span class="ident">T</span>; <span class="number">16</span>],
<span class="ident">children</span>: [<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span>[<span class="ident">T</span>; <span class="number">16</span>]<span class="op">></span><span class="op">></span>; <span class="number">16</span>],
}
<span class="kw">struct</span> <span class="ident">DynHuffman16</span> {
<span class="ident">patterns</span>: <span class="ident">Box</span><span class="op"><</span>[<span class="ident">u16</span>; <span class="number">256</span>]<span class="op">></span>,
<span class="ident">rest</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Trie8bit</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">DynHuffman16</span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">clens</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">DynHuffman16</span>, <span class="ident">String</span><span class="op">></span> {
<span class="comment">// Fill in the 8-bit patterns that match each code.</span>
<span class="comment">// Longer patterns go into the trie.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">patterns</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>([<span class="number">0xffffu16</span>; <span class="number">256</span>]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rest</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="macro">with_codes</span><span class="macro">!</span>(<span class="ident">clens</span>, <span class="number">15</span> <span class="op">=</span><span class="op">></span> <span class="ident">u16</span>, <span class="op">|</span><span class="ident">i</span>: <span class="ident">u16</span>, <span class="ident">code</span>: <span class="ident">u16</span>, <span class="ident">bits</span>: <span class="ident">u8</span><span class="op">|</span> <span class="op">-</span><span class="op">></span> <span class="kw">_</span> {
<span class="kw">let</span> <span class="ident">entry</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">|</span> ((<span class="ident">bits</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op"><</span><span class="op"><</span> <span class="number">12</span>);
<span class="kw">if</span> <span class="ident">bits</span> <span class="op"><</span><span class="op">=</span> <span class="number">8</span> {
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">BIT_REV_U8</span>.<span class="ident">get</span>((<span class="ident">code</span> <span class="op"><</span><span class="op"><</span> (<span class="number">8</span> <span class="op">-</span> <span class="ident">bits</span>)) <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid length code"</span>.<span class="ident">to_owned</span>())
};
<span class="kw">for</span> <span class="ident">rest</span> <span class="kw">in</span> <span class="number">0u8</span> .. <span class="number">1</span> <span class="op"><</span><span class="op"><</span> (<span class="number">8</span> <span class="op">-</span> <span class="ident">bits</span>) {
<span class="ident">patterns</span>[(<span class="ident">base</span> <span class="op">|</span> (<span class="ident">rest</span> <span class="op"><</span><span class="op"><</span> (<span class="ident">bits</span> <span class="op">&</span> <span class="number">7</span>))) <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">entry</span>;
}
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">low</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">BIT_REV_U8</span>.<span class="ident">get</span>((<span class="ident">code</span> <span class="op">></span><span class="op">></span> (<span class="ident">bits</span> <span class="op">-</span> <span class="number">8</span>)) <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid length code"</span>.<span class="ident">to_owned</span>())
};
<span class="kw">let</span> <span class="ident">high</span> <span class="op">=</span> <span class="ident">BIT_REV_U8</span>[((<span class="ident">code</span> <span class="op"><</span><span class="op"><</span> (<span class="number">16</span> <span class="op">-</span> <span class="ident">bits</span>)) <span class="op">&</span> <span class="number">0xff</span>) <span class="kw">as</span> <span class="ident">usize</span>];
<span class="kw">let</span> (<span class="ident">min_bits</span>, <span class="ident">idx</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">patterns</span>[<span class="ident">low</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">!</span><span class="op">=</span> <span class="number">0xffff</span> {
<span class="kw">let</span> <span class="ident">bits_prev</span> <span class="op">=</span> (<span class="ident">patterns</span>[<span class="ident">low</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">></span><span class="op">></span> <span class="number">12</span>) <span class="kw">as</span> <span class="ident">u8</span>;
(<span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">bits_prev</span>, <span class="ident">bits</span>), <span class="ident">patterns</span>[<span class="ident">low</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">&</span> <span class="number">0x7ff</span>)
} <span class="kw">else</span> {
<span class="ident">rest</span>.<span class="ident">push</span>(<span class="ident">Trie8bit</span> {
<span class="ident">data</span>: [<span class="number">0xffff</span>; <span class="number">16</span>],
<span class="ident">children</span>: [
<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>,
<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>,
<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>,
<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>
]
});
(<span class="ident">bits</span>, (<span class="ident">rest</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">u16</span>)
};
<span class="ident">patterns</span>[<span class="ident">low</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">idx</span> <span class="op">|</span> <span class="number">0x800</span> <span class="op">|</span> ((<span class="ident">min_bits</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op"><</span><span class="op"><</span> <span class="number">12</span>);
<span class="kw">let</span> <span class="ident">trie_entry</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">rest</span>.<span class="ident">get_mut</span>(<span class="ident">idx</span> <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid huffman code"</span>.<span class="ident">to_owned</span>())
};
<span class="kw">if</span> <span class="ident">bits</span> <span class="op"><</span><span class="op">=</span> <span class="number">12</span> {
<span class="kw">for</span> <span class="ident">rest</span> <span class="kw">in</span> <span class="number">0u8</span> .. <span class="number">1</span> <span class="op"><</span><span class="op"><</span> (<span class="number">12</span> <span class="op">-</span> <span class="ident">bits</span>) {
<span class="ident">trie_entry</span>.<span class="ident">data</span>[(<span class="ident">high</span> <span class="op">|</span> (<span class="ident">rest</span> <span class="op"><</span><span class="op"><</span> (<span class="ident">bits</span> <span class="op">-</span> <span class="number">8</span>))) <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">entry</span>;
}
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">child</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">trie_entry</span>.<span class="ident">children</span>[(<span class="ident">high</span> <span class="op">&</span> <span class="number">0xf</span>) <span class="kw">as</span> <span class="ident">usize</span>];
<span class="kw">if</span> <span class="ident">child</span>.<span class="ident">is_none</span>() {
<span class="kw-2">*</span><span class="ident">child</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">new</span>([<span class="number">0xffff</span>; <span class="number">16</span>]));
}
<span class="kw">let</span> <span class="ident">child</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">child</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">high_top</span> <span class="op">=</span> <span class="ident">high</span> <span class="op">></span><span class="op">></span> <span class="number">4</span>;
<span class="kw">for</span> <span class="ident">rest</span> <span class="kw">in</span> <span class="number">0u8</span> .. <span class="number">1</span> <span class="op"><</span><span class="op"><</span> (<span class="number">16</span> <span class="op">-</span> <span class="ident">bits</span>) {
<span class="ident">child</span>[(<span class="ident">high_top</span> <span class="op">|</span> (<span class="ident">rest</span> <span class="op"><</span><span class="op"><</span> (<span class="ident">bits</span> <span class="op">-</span> <span class="number">12</span>))) <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">entry</span>;
}
}
}
<span class="prelude-val">Ok</span>(())
});
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">"=== DYN HUFFMAN ==="</span>);
<span class="kw">for</span> <span class="ident">_i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">256</span> {
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">"{:08b} {:04x}"</span>, <span class="ident">_i</span>, <span class="ident">patterns</span>[<span class="ident">BIT_REV_U8</span>[<span class="ident">_i</span>] <span class="kw">as</span> <span class="ident">usize</span>]);
}
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">"==================="</span>);
<span class="prelude-val">Ok</span>(<span class="ident">DynHuffman16</span> {
<span class="ident">patterns</span>: <span class="ident">patterns</span>,
<span class="ident">rest</span>: <span class="ident">rest</span>,
})
}
<span class="kw">fn</span> <span class="ident">read</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">stream</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">BitStream</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">BitStream</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">u16</span>)<span class="op">></span>, <span class="ident">String</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">has8</span> <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">need</span>(<span class="number">8</span>);
<span class="kw">let</span> <span class="ident">entry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">patterns</span>[(<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">&</span> <span class="number">0xff</span>) <span class="kw">as</span> <span class="ident">usize</span>];
<span class="kw">let</span> <span class="ident">bits</span> <span class="op">=</span> (<span class="ident">entry</span> <span class="op">></span><span class="op">></span> <span class="number">12</span>) <span class="kw">as</span> <span class="ident">u8</span>;
<span class="prelude-val">Ok</span>(<span class="kw">if</span> <span class="op">!</span><span class="ident">has8</span> {
<span class="kw">if</span> <span class="ident">bits</span> <span class="op"><</span><span class="op">=</span> <span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">n</span> {
<span class="kw">let</span> <span class="ident">save</span> <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">clone</span>();
<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">-</span><span class="op">=</span> <span class="ident">bits</span>;
<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="ident">bits</span>;
<span class="prelude-val">Some</span>((<span class="ident">save</span>, <span class="ident">entry</span> <span class="op">&</span> <span class="number">0xfff</span>))
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">bits</span> <span class="op"><</span><span class="op">=</span> <span class="number">8</span> {
<span class="kw">let</span> <span class="ident">save</span> <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">clone</span>();
<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">-</span><span class="op">=</span> <span class="ident">bits</span>;
<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="ident">bits</span>;
<span class="prelude-val">Some</span>((<span class="ident">save</span>, <span class="ident">entry</span> <span class="op">&</span> <span class="number">0xfff</span>))
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">has16</span> <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">need</span>(<span class="number">16</span>);
<span class="kw">let</span> <span class="ident">trie</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">rest</span>.<span class="ident">get</span>((<span class="ident">entry</span> <span class="op">&</span> <span class="number">0x7ff</span>) <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="prelude-val">Some</span>(<span class="ident">trie</span>) <span class="op">=</span><span class="op">></span> <span class="ident">trie</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid entry in stream"</span>.<span class="ident">to_owned</span>()),
};
<span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">></span><span class="op">></span> <span class="number">8</span>;
<span class="kw">let</span> <span class="ident">trie_entry</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">trie</span>.<span class="ident">children</span>[(<span class="ident">idx</span> <span class="op">&</span> <span class="number">0xf</span>) <span class="kw">as</span> <span class="ident">usize</span>] {
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">child</span>) <span class="op">=</span><span class="op">></span> <span class="ident">child</span>[((<span class="ident">idx</span> <span class="op">></span><span class="op">></span> <span class="number">4</span>) <span class="op">&</span> <span class="number">0xf</span>) <span class="kw">as</span> <span class="ident">usize</span>],
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="ident">trie</span>.<span class="ident">data</span>[(<span class="ident">idx</span> <span class="op">&</span> <span class="number">0xf</span>) <span class="kw">as</span> <span class="ident">usize</span>],
};
<span class="kw">let</span> <span class="ident">trie_bits</span> <span class="op">=</span> (<span class="ident">trie_entry</span> <span class="op">></span><span class="op">></span> <span class="number">12</span>) <span class="kw">as</span> <span class="ident">u8</span>;
<span class="kw">if</span> <span class="ident">has16</span> <span class="op">|</span><span class="op">|</span> <span class="ident">trie_bits</span> <span class="op"><</span><span class="op">=</span> <span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">n</span> {
<span class="kw">let</span> <span class="ident">save</span> <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">clone</span>();
<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">n</span> <span class="op">-</span><span class="op">=</span> <span class="ident">trie_bits</span>;
<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">v</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="ident">trie_bits</span>;
<span class="prelude-val">Some</span>((<span class="ident">save</span>, <span class="ident">trie_entry</span> <span class="op">&</span> <span class="number">0xfff</span>))
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
})
}
}
<span class="kw">enum</span> <span class="ident">State</span> {
<span class="ident">ZlibMethodAndFlags</span>, <span class="comment">// CMF</span>
<span class="ident">ZlibFlags</span>(<span class="comment">/* CMF */</span> <span class="ident">u8</span>), <span class="comment">// FLG,</span>
<span class="ident">Bits</span>(<span class="ident">BitsNext</span>, <span class="ident">BitState</span>),
<span class="ident">LenDist</span>((<span class="ident">BitsNext</span>, <span class="ident">BitState</span>), <span class="comment">/* len */</span> <span class="ident">u16</span>, <span class="comment">/* dist */</span> <span class="ident">u16</span>),
<span class="ident">Uncompressed</span>(<span class="comment">/* len */</span> <span class="ident">u16</span>),
<span class="ident">CheckCRC</span>(<span class="comment">/* len */</span> <span class="ident">u8</span>, <span class="comment">/* bytes */</span> [<span class="ident">u8</span>; <span class="number">4</span>]),
<span class="ident">Finished</span>
}
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">State</span>::<span class="kw-2">*</span>;
<span class="kw">enum</span> <span class="ident">BitsNext</span> {
<span class="ident">BlockHeader</span>,
<span class="ident">BlockUncompressedLen</span>,
<span class="ident">BlockUncompressedNlen</span>(<span class="comment">/* len */</span> <span class="ident">u16</span>),
<span class="ident">BlockDynHlit</span>,
<span class="ident">BlockDynHdist</span>(<span class="comment">/* hlit */</span> <span class="ident">u8</span>),
<span class="ident">BlockDynHclen</span>(<span class="comment">/* hlit */</span> <span class="ident">u8</span>, <span class="comment">/* hdist */</span> <span class="ident">u8</span>),
<span class="ident">BlockDynClenCodeLengths</span>(<span class="comment">/* hlit */</span> <span class="ident">u8</span>, <span class="comment">/* hdist */</span> <span class="ident">u8</span>, <span class="comment">/* hclen */</span> <span class="ident">u8</span>, <span class="comment">/* idx */</span> <span class="ident">u8</span>, <span class="comment">/* clens */</span> <span class="ident">Box</span><span class="op"><</span>[<span class="ident">u8</span>; <span class="number">19</span>]<span class="op">></span>),
<span class="ident">BlockDynCodeLengths</span>(<span class="ident">CodeLengthReader</span>),
<span class="ident">BlockDyn</span>(<span class="comment">/* lit/len */</span> <span class="ident">DynHuffman16</span>, <span class="comment">/* dist */</span> <span class="ident">DynHuffman16</span>, <span class="comment">/* prev_len */</span> <span class="ident">u16</span>)
}
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">BitsNext</span>::<span class="kw-2">*</span>;
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InflateStream</span> {
<span class="ident">buffer</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="ident">pos</span>: <span class="ident">u16</span>,
<span class="ident">state</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">State</span><span class="op">></span>,
<span class="ident">final_block</span>: <span class="ident">bool</span>,
<span class="ident">checksum</span>: <span class="ident">Checksum</span>,
<span class="ident">read_checksum</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">InflateStream</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="doccomment">/// Create a new stream for decoding raw deflate encoded data.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">InflateStream</span> {
<span class="kw">let</span> <span class="ident">state</span> <span class="op">=</span> <span class="ident">Bits</span>(<span class="ident">BlockHeader</span>, <span class="ident">BitState</span> { <span class="ident">n</span>: <span class="number">0</span>, <span class="ident">v</span>: <span class="number">0</span> });
<span class="kw">let</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="number">32</span> <span class="op">*</span> <span class="number">1024</span>);
<span class="ident">InflateStream</span>::<span class="ident">with_state_and_buffer</span>(<span class="ident">state</span>, <span class="ident">buffer</span>, <span class="ident">Checksum</span>::<span class="ident">none</span>())
}
<span class="doccomment">/// Create a new stream for decoding deflate encoded data with a zlib header and footer</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_zlib</span>() <span class="op">-</span><span class="op">></span> <span class="ident">InflateStream</span> {
<span class="ident">InflateStream</span>::<span class="ident">with_state_and_buffer</span>(<span class="ident">ZlibMethodAndFlags</span>, <span class="ident">Vec</span>::<span class="ident">new</span>(), <span class="ident">Checksum</span>::<span class="ident">zlib</span>())
}
<span class="doccomment">/// Create a new stream for decoding deflate encoded data with a zlib header and footer</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This version creates a decoder that does not checksum the data to validate it with the</span>
<span class="doccomment">/// checksum provided with the zlib wrapper.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_zlib_no_checksum</span>() <span class="op">-</span><span class="op">></span> <span class="ident">InflateStream</span> {
<span class="ident">InflateStream</span>::<span class="ident">with_state_and_buffer</span>(<span class="ident">ZlibMethodAndFlags</span>, <span class="ident">Vec</span>::<span class="ident">new</span>(), <span class="ident">Checksum</span>::<span class="ident">none</span>())
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reset</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">clear</span>();
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="number">0</span>;
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Bits</span>(<span class="ident">BlockHeader</span>, <span class="ident">BitState</span> { <span class="ident">n</span>: <span class="number">0</span>, <span class="ident">v</span>: <span class="number">0</span> }));
<span class="self">self</span>.<span class="ident">final_block</span> <span class="op">=</span> <span class="bool-val">false</span>;
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reset_to_zlib</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">reset</span>();
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">ZlibMethodAndFlags</span>);
}
<span class="kw">fn</span> <span class="ident">with_state_and_buffer</span>(<span class="ident">state</span>: <span class="ident">State</span>, <span class="ident">buffer</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">checksum</span>: <span class="ident">Checksum</span>)
<span class="op">-</span><span class="op">></span> <span class="ident">InflateStream</span> {
<span class="ident">InflateStream</span> {
<span class="ident">buffer</span>: <span class="ident">buffer</span>,
<span class="ident">pos</span>: <span class="number">0</span>,
<span class="ident">state</span>: <span class="prelude-val">Some</span>(<span class="ident">state</span>),
<span class="ident">final_block</span>: <span class="bool-val">false</span>,
<span class="ident">checksum</span>: <span class="ident">checksum</span>,
<span class="ident">read_checksum</span>: <span class="prelude-val">None</span>,
}
}
<span class="kw">fn</span> <span class="ident">run_len_dist</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">len</span>: <span class="ident">u16</span>, <span class="ident">dist</span>: <span class="ident">u16</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span>, <span class="ident">String</span><span class="op">></span> {
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">"RLE -{}; {} (cap={} len={})"</span>, <span class="ident">dist</span>, <span class="ident">len</span>,
<span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">capacity</span>(), <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">len</span>());
<span class="kw">if</span> <span class="ident">dist</span> <span class="op"><</span> <span class="number">1</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid run length in stream"</span>.<span class="ident">to_owned</span>());
}
<span class="comment">// `buffer_size` is used for validating `unsafe` below, handle with care</span>
<span class="kw">let</span> <span class="ident">buffer_size</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">capacity</span>() <span class="kw">as</span> <span class="ident">u16</span>;
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op"><</span> <span class="ident">dist</span> {
<span class="comment">// Handle copying from ahead, until we hit the end reading.</span>
<span class="kw">let</span> <span class="ident">pos_end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op">+</span> <span class="ident">len</span>;
<span class="kw">let</span> (<span class="ident">pos_end</span>, <span class="ident">left</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">pos_end</span> <span class="op"><</span> <span class="ident">dist</span> {
(<span class="ident">pos_end</span>, <span class="number">0</span>)
} <span class="kw">else</span> {
(<span class="ident">dist</span>, <span class="ident">pos_end</span> <span class="op">-</span> <span class="ident">dist</span>)
};
<span class="kw">if</span> <span class="ident">dist</span> <span class="op">></span> <span class="ident">buffer_size</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"run length distance is bigger than the window size"</span>.<span class="ident">to_owned</span>());
}
<span class="kw">let</span> <span class="ident">forward</span> <span class="op">=</span> <span class="ident">buffer_size</span> <span class="op">-</span> <span class="ident">dist</span>;
<span class="kw">if</span> <span class="ident">pos_end</span> <span class="op">+</span> <span class="ident">forward</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u16</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid run length in stream"</span>.<span class="ident">to_owned</span>());
}
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>..<span class="ident">pos_end</span> <span class="kw">as</span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">buffer</span>[<span class="ident">i</span>] <span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer</span>[<span class="ident">i</span> <span class="op">+</span> <span class="ident">forward</span> <span class="kw">as</span> <span class="ident">usize</span>];
}
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="ident">pos_end</span>;
<span class="ident">left</span>
} <span class="kw">else</span> {
<span class="ident">len</span>
};
<span class="comment">// Handle copying from before, until we hit the end writing.</span>
<span class="kw">let</span> <span class="ident">pos_end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op">+</span> <span class="ident">len</span>;
<span class="kw">let</span> (<span class="ident">pos_end</span>, <span class="ident">left</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">pos_end</span> <span class="op"><</span><span class="op">=</span> <span class="ident">buffer_size</span> {
(<span class="ident">pos_end</span>, <span class="prelude-val">None</span>)
} <span class="kw">else</span> {
(<span class="ident">buffer_size</span>, <span class="prelude-val">Some</span>(<span class="ident">pos_end</span> <span class="op">-</span> <span class="ident">buffer_size</span>))
};
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op"><</span> <span class="ident">dist</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">pos_end</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">pos</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"invalid run length in stream"</span>.<span class="ident">to_owned</span>());
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">pos_end</span> <span class="kw">as</span> <span class="ident">usize</span> {
<span class="comment">// ensure the buffer length will not exceed the amount of allocated memory</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">pos_end</span> <span class="op"><</span><span class="op">=</span> <span class="ident">buffer_size</span>);
<span class="comment">// ensure that the uninitialized chunk of memory will be fully overwritten</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op"><</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">len</span>());
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">set_len</span>(<span class="ident">pos_end</span> <span class="kw">as</span> <span class="ident">usize</span>);
}
}
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">dist</span> <span class="op">></span> <span class="number">0</span>); <span class="comment">// validation against reading uninitialized memory</span>
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>..<span class="ident">pos_end</span> <span class="kw">as</span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">buffer</span>[<span class="ident">i</span>] <span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer</span>[<span class="ident">i</span> <span class="op">-</span> <span class="ident">dist</span> <span class="kw">as</span> <span class="ident">usize</span>];
}
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="ident">pos_end</span>;
<span class="prelude-val">Ok</span>(<span class="ident">left</span>)
}
<span class="kw">fn</span> <span class="ident">next_state</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">String</span><span class="op">></span> {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ok_bytes</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">state</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> ({
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">state</span>);
<span class="prelude-val">Ok</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>)
}));
<span class="kw">let</span> <span class="ident">debug_byte</span> <span class="op">=</span> <span class="op">|</span><span class="ident">_i</span>, <span class="ident">_b</span><span class="op">|</span> <span class="macro">debug</span><span class="macro">!</span>(<span class="string">"[{:04x}] {:02x}"</span>, <span class="ident">_i</span>, <span class="ident">_b</span>);
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">push_or</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">capacity</span>() <span class="kw">as</span> <span class="ident">u16</span> {
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>;
<span class="ident">debug_byte</span>(<span class="self">self</span>.<span class="ident">pos</span>, <span class="ident">b</span>);
<span class="kw">if</span> (<span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">len</span>() {
<span class="self">self</span>.<span class="ident">buffer</span>[<span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">b</span>;
} <span class="kw">else</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">len</span>());
<span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">push</span>(<span class="ident">b</span>);
}
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>;
}));
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">run_len_dist</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">dist</span>:<span class="ident">expr</span> <span class="op">=</span><span class="op">></span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">bytes</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">state</span>:<span class="ident">expr</span>)) <span class="op">=</span><span class="op">></span> ({
<span class="kw">let</span> <span class="ident">dist</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">dist</span>;
<span class="kw">let</span> <span class="ident">left</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">run_len_dist</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>, <span class="ident">dist</span>));
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">len</span>) <span class="op">=</span> <span class="ident">left</span> {
<span class="kw">return</span> <span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">bytes</span>, <span class="ident">LenDist</span>((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">state</span>), <span class="ident">len</span>, <span class="ident">dist</span>));
}
}));
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>() {
<span class="ident">ZlibMethodAndFlags</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">data</span>.<span class="ident">get</span>(<span class="number">0</span>) {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">x</span>) <span class="op">=</span><span class="op">></span> <span class="ident">x</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">ZlibMethodAndFlags</span>);
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">0</span>);
}
};
<span class="kw">let</span> (<span class="ident">method</span>, <span class="ident">info</span>) <span class="op">=</span> (<span class="ident">b</span> <span class="op">&</span> <span class="number">0xF</span>, <span class="ident">b</span> <span class="op">></span><span class="op">></span> <span class="number">4</span>);
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">"ZLIB CM=0x{:x} CINFO=0x{:x}"</span>, <span class="ident">method</span>, <span class="ident">info</span>);
<span class="comment">// CM = 8 (DEFLATE) is the only method defined by the ZLIB specification.</span>
<span class="kw">match</span> <span class="ident">method</span> {
<span class="number">8</span> <span class="op">=</span><span class="op">></span> {<span class="comment">/* DEFLATE */</span>}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"unknown ZLIB method CM=0x{:x}"</span>, <span class="ident">method</span>))
}
<span class="kw">if</span> <span class="ident">info</span> <span class="op">></span> <span class="number">7</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"invalid ZLIB info CINFO=0x{:x}"</span>, <span class="ident">info</span>));
}
<span class="self">self</span>.<span class="ident">buffer</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="number">1</span> <span class="op"><</span><span class="op"><</span> (<span class="number">8</span> <span class="op">+</span> <span class="ident">info</span>));
<span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">ZlibFlags</span>(<span class="ident">b</span>))
}
<span class="ident">ZlibFlags</span>(<span class="ident">cmf</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">data</span>.<span class="ident">get</span>(<span class="number">0</span>) {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">x</span>) <span class="op">=</span><span class="op">></span> <span class="ident">x</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">ZlibFlags</span>(<span class="ident">cmf</span>));
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">0</span>);
}
};
<span class="kw">let</span> (<span class="ident">_check</span>, <span class="ident">dict</span>, <span class="ident">_level</span>) <span class="op">=</span> (<span class="ident">b</span> <span class="op">&</span> <span class="number">0x1F</span>, (<span class="ident">b</span> <span class="op">&</span> <span class="number">0x20</span>) <span class="op">!</span><span class="op">=</span> <span class="number">0</span>, <span class="ident">b</span> <span class="op">></span><span class="op">></span> <span class="number">6</span>);
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">"ZLIB FCHECK=0x{:x} FDICT={} FLEVEL=0x{:x}"</span>, <span class="ident">_check</span>, <span class="ident">dict</span>, <span class="ident">_level</span>);
<span class="kw">if</span> (((<span class="ident">cmf</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op"><</span><span class="op"><</span> <span class="number">8</span>) <span class="op">|</span> <span class="ident">b</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op">%</span> <span class="number">31</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"invalid ZLIB checksum CMF=0x{:x} FLG=0x{:x}"</span>, <span class="ident">cmf</span>, <span class="ident">b</span>));
}
<span class="kw">if</span> <span class="ident">dict</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">"unimplemented ZLIB FDICT=1"</span>.<span class="ident">into</span>());
}
<span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">Bits</span>(<span class="ident">BlockHeader</span>, <span class="ident">BitState</span> { <span class="ident">n</span>: <span class="number">0</span>, <span class="ident">v</span>: <span class="number">0</span> }))
}
<span class="ident">Bits</span>(<span class="ident">next</span>, <span class="ident">state</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stream</span> <span class="op">=</span> <span class="ident">BitStream</span>::<span class="ident">new</span>(<span class="ident">data</span>, <span class="ident">state</span>);
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ok_state</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">state</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> ({<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">state</span>); <span class="prelude-val">Ok</span>(<span class="ident">stream</span>.<span class="ident">used</span>)}));
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ok</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">ok_state</span><span class="macro">!</span>(<span class="ident">Bits</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>, <span class="ident">stream</span>.<span class="ident">fill</span>()))));
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">take</span> (
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="kw">match</span> <span class="ident">stream</span>.<span class="ident">take</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>) {
<span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="macro">ok</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>)
});
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">take</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span> <span class="op">=</span><span class="op">></span> <span class="ident">next</span>))
);
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">take16</span> (
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="kw">match</span> <span class="ident">stream</span>.<span class="ident">take16</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>) {
<span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="macro">ok</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>)
});
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">take16</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span> <span class="op">=</span><span class="op">></span> <span class="ident">next</span>))
);
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">len_dist</span> (
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>:<span class="ident">expr</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">next_early</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> ({
<span class="kw">let</span> <span class="ident">dist</span> <span class="op">=</span> <span class="number">1</span> <span class="op">+</span> <span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> { <span class="number">0</span> } <span class="kw">else</span> { <span class="comment">// new_base</span>
<span class="number">2</span> <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>
} <span class="op">+</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">code</span> <span class="kw">as</span> <span class="ident">u16</span> <span class="op">-</span> <span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> { <span class="number">0</span> } <span class="kw">else</span> { <span class="comment">// old_base</span>
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">*</span> <span class="number">2</span> <span class="op">+</span> <span class="number">2</span>
}) <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>) <span class="op">+</span> <span class="macro">take16</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">next_early</span>) <span class="kw">as</span> <span class="ident">u16</span>;
<span class="macro">run_len_dist</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>, <span class="ident">dist</span> <span class="op">=</span><span class="op">></span> (<span class="ident">stream</span>.<span class="ident">used</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>, <span class="ident">stream</span>.<span class="ident">state</span>));
});
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="macro">len_dist</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">></span> <span class="ident">next</span>, <span class="ident">next</span>)
)
);
<span class="kw">match</span> <span class="ident">next</span> {
<span class="ident">BlockHeader</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">final_block</span> {
<span class="kw">let</span> (<span class="ident">len</span>, <span class="ident">bytes</span>) <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">trailing_bytes</span>();
<span class="kw">return</span> <span class="macro">ok_state</span><span class="macro">!</span>(<span class="ident">CheckCRC</span>(<span class="ident">len</span>, <span class="ident">bytes</span>));
}
<span class="kw">let</span> <span class="ident">h</span> <span class="op">=</span> <span class="macro">take</span><span class="macro">!</span>(<span class="number">3</span>);
<span class="kw">let</span> (<span class="ident">final_</span>, <span class="ident">block_type</span>) <span class="op">=</span> ((<span class="ident">h</span> <span class="op">&</span> <span class="number">1</span>) <span class="op">!</span><span class="op">=</span> <span class="number">0</span>, (<span class="ident">h</span> <span class="op">></span><span class="op">></span> <span class="number">1</span>) <span class="op">&</span> <span class="number">0b11</span>);
<span class="self">self</span>.<span class="ident">final_block</span> <span class="op">=</span> <span class="ident">final_</span>;
<span class="kw">match</span> <span class="ident">block_type</span> {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// Skip to the next byte for an uncompressed block.</span>
<span class="ident">stream</span>.<span class="ident">align_byte</span>();
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockUncompressedLen</span>)
}
<span class="number">1</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// Unwrap is safe because the data is valid.</span>
<span class="kw">let</span> <span class="ident">lit</span> <span class="op">=</span> <span class="ident">DynHuffman16</span>::<span class="ident">new</span>(<span class="kw-2">&</span>[
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 0-15</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 16-31</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 32-47</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 48-63</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 64-79</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 80-95</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 96-101</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 112-127</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 128-143</span>
<span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="comment">// 144-159</span>
<span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="comment">// 160-175</span>
<span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="comment">// 176-191</span>
<span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="comment">// 192-207</span>
<span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="comment">// 208-223</span>
<span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="comment">// 224-239</span>
<span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="comment">// 240-255</span>
<span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="comment">// 256-271</span>
<span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="comment">// 272-279</span>
<span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="number">8</span>, <span class="comment">// 280-287</span>
]).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">dist</span> <span class="op">=</span> <span class="ident">DynHuffman16</span>::<span class="ident">new</span>(<span class="kw-2">&</span>[
<span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>,
<span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>,
<span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>,
<span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>, <span class="number">5</span>
]).<span class="ident">unwrap</span>();
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDyn</span>(<span class="ident">lit</span>, <span class="ident">dist</span>, <span class="number">0</span>))
}
<span class="number">2</span> <span class="op">=</span><span class="op">></span> <span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynHlit</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"unimplemented DEFLATE block type 0b{:?}"</span>,
<span class="ident">block_type</span>))
}
}
}
<span class="ident">BlockUncompressedLen</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="macro">take16</span><span class="macro">!</span>(<span class="number">16</span>);
<span class="macro">ok_state</span><span class="macro">!</span>(<span class="ident">Bits</span>(<span class="ident">BlockUncompressedNlen</span>(<span class="ident">len</span>), <span class="ident">stream</span>.<span class="ident">state</span>))
}
<span class="ident">BlockUncompressedNlen</span>(<span class="ident">len</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">nlen</span> <span class="op">=</span> <span class="macro">take16</span><span class="macro">!</span>(<span class="number">16</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">stream</span>.<span class="ident">state</span>.<span class="ident">n</span>, <span class="number">0</span>);
<span class="kw">if</span> <span class="op">!</span><span class="ident">len</span> <span class="op">!</span><span class="op">=</span> <span class="ident">nlen</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"invalid uncompressed block len: LEN: {:04x} NLEN: {:04x}"</span>, <span class="ident">len</span>, <span class="ident">nlen</span>));
}
<span class="macro">ok_state</span><span class="macro">!</span>(<span class="ident">Uncompressed</span>(<span class="ident">len</span>))
}
<span class="ident">BlockDynHlit</span> <span class="op">=</span><span class="op">></span> <span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynHdist</span>(<span class="macro">take</span><span class="macro">!</span>(<span class="number">5</span>) <span class="op">+</span> <span class="number">1</span>)),
<span class="ident">BlockDynHdist</span>(<span class="ident">hlit</span>) <span class="op">=</span><span class="op">></span> <span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynHclen</span>(<span class="ident">hlit</span>, <span class="macro">take</span><span class="macro">!</span>(<span class="number">5</span>) <span class="op">+</span> <span class="number">1</span>)),
<span class="ident">BlockDynHclen</span>(<span class="ident">hlit</span>, <span class="ident">hdist</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynClenCodeLengths</span>(<span class="ident">hlit</span>, <span class="ident">hdist</span>, <span class="macro">take</span><span class="macro">!</span>(<span class="number">4</span>) <span class="op">+</span> <span class="number">4</span>, <span class="number">0</span>, <span class="ident">Box</span>::<span class="ident">new</span>([<span class="number">0</span>; <span class="number">19</span>])))
}
<span class="ident">BlockDynClenCodeLengths</span>(<span class="ident">hlit</span>, <span class="ident">hdist</span>, <span class="ident">hclen</span>, <span class="ident">i</span>, <span class="kw-2">mut</span> <span class="ident">clens</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span>
<span class="kw">match</span> <span class="ident">stream</span>.<span class="ident">take</span>(<span class="number">3</span>) {
<span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynClenCodeLengths</span>(<span class="ident">hlit</span>, <span class="ident">hdist</span>, <span class="ident">hclen</span>, <span class="ident">i</span>, <span class="ident">clens</span>)),
};
<span class="ident">clens</span>[[<span class="number">16</span>, <span class="number">17</span>, <span class="number">18</span>, <span class="number">0</span>, <span class="number">8</span>, <span class="number">7</span>, <span class="number">9</span>, <span class="number">6</span>, <span class="number">10</span>, <span class="number">5</span>, <span class="number">11</span>, <span class="number">4</span>, <span class="number">12</span>, <span class="number">3</span>, <span class="number">13</span>, <span class="number">2</span>, <span class="number">14</span>, <span class="number">1</span>, <span class="number">15</span>][<span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span>]] <span class="op">=</span> <span class="ident">v</span>;
<span class="kw">if</span> <span class="ident">i</span> <span class="op"><</span> <span class="ident">hclen</span> <span class="op">-</span> <span class="number">1</span> {
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynClenCodeLengths</span>(<span class="ident">hlit</span>, <span class="ident">hdist</span>, <span class="ident">hclen</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">clens</span>))
} <span class="kw">else</span> {
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynCodeLengths</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">CodeLengthReader</span>::<span class="ident">new</span>(<span class="ident">clens</span>, <span class="ident">hlit</span> <span class="kw">as</span> <span class="ident">u16</span> <span class="op">+</span> <span class="number">256</span>, <span class="ident">hdist</span>))))
}
}
<span class="ident">BlockDynCodeLengths</span>(<span class="kw-2">mut</span> <span class="ident">reader</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">finished</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">stream</span>));
<span class="kw">if</span> <span class="ident">finished</span> {
<span class="kw">let</span> (<span class="ident">lit</span>, <span class="ident">dist</span>) <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">to_lit_and_dist</span>());
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDyn</span>(<span class="ident">lit</span>, <span class="ident">dist</span>, <span class="number">0</span>))
} <span class="kw">else</span> {
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockDynCodeLengths</span>(<span class="ident">reader</span>))
}
}
<span class="ident">BlockDyn</span>(<span class="ident">huff_lit_len</span>, <span class="ident">huff_dist</span>, <span class="kw-2">mut</span> <span class="ident">prev_len</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">next</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">save_len</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="ident">BlockDyn</span>(<span class="ident">huff_lit_len</span>, <span class="ident">huff_dist</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">save_len</span>)));
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">prev_len</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">prev_len</span>;
<span class="ident">prev_len</span> <span class="op">=</span> <span class="number">0</span>;
<span class="ident">len</span>
} <span class="kw">else</span> {
<span class="kw">let</span> (<span class="ident">save</span>, <span class="ident">code16</span>) <span class="op">=</span> <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">huff_lit_len</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">stream</span>)) {
<span class="prelude-val">Some</span>(<span class="ident">data</span>) <span class="op">=</span><span class="op">></span> <span class="ident">data</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="macro">ok</span><span class="macro">!</span>(<span class="macro">next</span><span class="macro">!</span>(<span class="number">0</span>)),
};
<span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="ident">code16</span> <span class="kw">as</span> <span class="ident">u8</span>;
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">"{:09b}"</span>, <span class="ident">code16</span>);
<span class="kw">match</span> <span class="ident">code16</span> {
<span class="number">0</span>...<span class="number">255</span> <span class="op">=</span><span class="op">></span> {
<span class="macro">push_or</span><span class="macro">!</span>(<span class="ident">code</span>, <span class="macro">ok</span><span class="macro">!</span>({<span class="ident">stream</span> <span class="op">=</span> <span class="ident">save</span>; <span class="macro">next</span><span class="macro">!</span>(<span class="number">0</span>)}));
<span class="kw">continue</span>;
}
<span class="number">256</span>...<span class="number">285</span> <span class="op">=</span><span class="op">></span> {}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"bad DEFLATE len code {}"</span>, <span class="ident">code</span>)),
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">len</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">code</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="number">3</span> <span class="op">+</span> <span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> { <span class="number">0</span> } <span class="kw">else</span> { <span class="comment">// new_base</span>
<span class="number">4</span> <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>
} <span class="op">+</span> ((<span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">code</span> <span class="op">=</span><span class="op">=</span> <span class="number">29</span> {
<span class="number">256</span>
} <span class="kw">else</span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">code</span> <span class="kw">as</span> <span class="ident">u16</span>
} <span class="op">-</span> <span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> { <span class="number">0</span> } <span class="kw">else</span> { <span class="comment">// old_base</span>
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">*</span> <span class="number">4</span> <span class="op">+</span> <span class="number">4</span>
} <span class="op">-</span> <span class="number">1</span>) <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>) <span class="op">+</span> <span class="macro">take</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">></span> {<span class="ident">stream</span> <span class="op">=</span> <span class="ident">save</span>; <span class="macro">next</span><span class="macro">!</span>(<span class="number">0</span>)}) <span class="kw">as</span> <span class="ident">u16</span>
));
<span class="kw">match</span> <span class="ident">code</span> {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">final_block</span> {
<span class="kw">let</span> (<span class="ident">len</span>, <span class="ident">bytes</span>) <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">trailing_bytes</span>();
<span class="macro">ok_state</span><span class="macro">!</span>(<span class="ident">CheckCRC</span>(<span class="ident">len</span>, <span class="ident">bytes</span>))
} <span class="kw">else</span> {
<span class="macro">ok</span><span class="macro">!</span>(<span class="ident">BlockHeader</span>)
}
}
<span class="number">1</span>...<span class="number">8</span> <span class="op">=</span><span class="op">></span> <span class="macro">len</span><span class="macro">!</span>(<span class="ident">code</span>, <span class="number">0</span>),
<span class="number">9</span>...<span class="number">12</span> <span class="op">=</span><span class="op">></span> <span class="macro">len</span><span class="macro">!</span>(<span class="ident">code</span>, <span class="number">1</span>),
<span class="number">13</span>...<span class="number">16</span> <span class="op">=</span><span class="op">></span> <span class="macro">len</span><span class="macro">!</span>(<span class="ident">code</span>, <span class="number">2</span>),
<span class="number">17</span>...<span class="number">20</span> <span class="op">=</span><span class="op">></span> <span class="macro">len</span><span class="macro">!</span>(<span class="ident">code</span>, <span class="number">3</span>),
<span class="number">21</span>...<span class="number">24</span> <span class="op">=</span><span class="op">></span> <span class="macro">len</span><span class="macro">!</span>(<span class="ident">code</span>, <span class="number">4</span>),
<span class="number">25</span>...<span class="number">28</span> <span class="op">=</span><span class="op">></span> <span class="macro">len</span><span class="macro">!</span>(<span class="ident">code</span>, <span class="number">5</span>),
<span class="number">29</span> <span class="op">=</span><span class="op">></span> <span class="macro">len</span><span class="macro">!</span>(<span class="number">29</span>, <span class="number">0</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"bad DEFLATE len code {}"</span>, <span class="ident">code</span> <span class="kw">as</span> <span class="ident">u16</span> <span class="op">+</span> <span class="number">256</span>)),
}
};
<span class="kw">let</span> (<span class="ident">save</span>, <span class="ident">dist_code</span>) <span class="op">=</span> <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">huff_dist</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">stream</span>)) {
<span class="prelude-val">Some</span>(<span class="ident">data</span>) <span class="op">=</span><span class="op">></span> <span class="ident">data</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="macro">ok</span><span class="macro">!</span>(<span class="macro">next</span><span class="macro">!</span>(<span class="ident">len</span>)),
};
<span class="macro">debug</span><span class="macro">!</span>(<span class="string">" {:05b}"</span>, <span class="ident">dist_code</span>);
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">len_dist_case</span> ((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="macro">len_dist</span><span class="macro">!</span>(<span class="ident">len</span>, <span class="ident">dist_code</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">bits</span> <span class="op">=</span><span class="op">></span> {<span class="ident">stream</span> <span class="op">=</span> <span class="ident">save</span>; <span class="macro">next</span><span class="macro">!</span>(<span class="ident">len</span>)}, <span class="macro">next</span><span class="macro">!</span>(<span class="number">0</span>))
));
<span class="kw">match</span> <span class="ident">dist_code</span> {
<span class="number">0</span>...<span class="number">3</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">0</span>),
<span class="number">4</span>...<span class="number">5</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">1</span>),
<span class="number">6</span>...<span class="number">7</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">2</span>),
<span class="number">8</span>...<span class="number">9</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">3</span>),
<span class="number">10</span>...<span class="number">11</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">4</span>),
<span class="number">12</span>...<span class="number">13</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">5</span>),
<span class="number">14</span>...<span class="number">15</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">6</span>),
<span class="number">16</span>...<span class="number">17</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">7</span>),
<span class="number">18</span>...<span class="number">19</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">8</span>),
<span class="number">20</span>...<span class="number">21</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">9</span>),
<span class="number">22</span>...<span class="number">23</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">10</span>),
<span class="number">24</span>...<span class="number">25</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">11</span>),
<span class="number">26</span>...<span class="number">27</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">12</span>),
<span class="number">28</span>...<span class="number">29</span> <span class="op">=</span><span class="op">></span> <span class="macro">len_dist_case</span><span class="macro">!</span>(<span class="number">13</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"bad DEFLATE dist code {}"</span>, <span class="ident">dist_code</span>)),
}
}
}
}
}
<span class="ident">LenDist</span>((<span class="ident">next</span>, <span class="ident">state</span>), <span class="ident">len</span>, <span class="ident">dist</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">run_len_dist</span><span class="macro">!</span>(<span class="ident">len</span>, <span class="ident">dist</span> <span class="op">=</span><span class="op">></span> (<span class="number">0</span>, <span class="ident">next</span>, <span class="ident">state</span>));
<span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">Bits</span>(<span class="ident">next</span>, <span class="ident">state</span>))
}
<span class="ident">Uncompressed</span>(<span class="kw-2">mut</span> <span class="ident">len</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&</span><span class="ident">b</span>) <span class="kw">in</span> <span class="ident">data</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">if</span> <span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="ident">i</span>, <span class="ident">Bits</span>(<span class="ident">BlockHeader</span>, <span class="ident">BitState</span> { <span class="ident">n</span>: <span class="number">0</span>, <span class="ident">v</span>: <span class="number">0</span> }));
}
<span class="macro">push_or</span><span class="macro">!</span>(<span class="ident">b</span>, <span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="ident">i</span>, <span class="ident">Uncompressed</span>(<span class="ident">len</span>)));
<span class="ident">len</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="ident">data</span>.<span class="ident">len</span>(), <span class="ident">Uncompressed</span>(<span class="ident">len</span>))
}
<span class="ident">CheckCRC</span>(<span class="kw-2">mut</span> <span class="ident">len</span>, <span class="kw-2">mut</span> <span class="ident">bytes</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">checksum</span>.<span class="ident">is_none</span>() {
<span class="comment">// TODO: inform caller of unused bytes</span>
<span class="kw">return</span> <span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">Finished</span>);
}
<span class="comment">// Get the checksum value from the end of the stream.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">used</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">len</span> <span class="op"><</span> <span class="number">4</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">used</span> <span class="op"><</span> <span class="ident">data</span>.<span class="ident">len</span>() {
<span class="ident">bytes</span>[<span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">data</span>[<span class="ident">used</span>];
<span class="ident">len</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="ident">used</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="kw">if</span> <span class="ident">len</span> <span class="op"><</span> <span class="number">4</span> {
<span class="kw">return</span> <span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="ident">used</span>, <span class="ident">CheckCRC</span>(<span class="ident">len</span>, <span class="ident">bytes</span>));
}
<span class="self">self</span>.<span class="ident">read_checksum</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">adler32_from_bytes</span>(<span class="kw-2">&</span><span class="ident">bytes</span>));
<span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="ident">used</span>, <span class="ident">Finished</span>)
}
<span class="ident">Finished</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// TODO: inform caller of unused bytes</span>
<span class="macro">ok_bytes</span><span class="macro">!</span>(<span class="ident">data</span>.<span class="ident">len</span>(), <span class="ident">Finished</span>)
}
}
}
<span class="doccomment">/// Try to uncompress/decode the data in `data`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On success, returns how many bytes of the input data was decompressed, and a reference to</span>
<span class="doccomment">/// the buffer containing the decompressed data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function may not uncompress all the provided data in one call, so it has to be called</span>
<span class="doccomment">/// repeatedly with the data that hasn't been decompressed yet as an input until the number of</span>
<span class="doccomment">/// bytes decoded returned is 0. (See the [top level crate documentation](index.html)</span>
<span class="doccomment">/// for an example.)</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">/// If invalid input data is encountered, a string describing what went wrong is returned.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">update</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">data</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>]), <span class="ident">String</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">original_size</span> <span class="op">=</span> <span class="ident">data</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="ident">original_pos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">empty</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">while</span> <span class="op">!</span><span class="ident">empty</span> <span class="kw-2">&</span><span class="op">&</span>
((<span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">capacity</span>() <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">capacity</span>() <span class="op">=</span><span class="op">=</span> <span class="number">0</span>) {
<span class="comment">// next_state must be called at least once after the data is empty.</span>
<span class="ident">empty</span> <span class="op">=</span> <span class="ident">data</span>.<span class="ident">is_empty</span>();
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">next_state</span>(<span class="ident">data</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">data</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">data</span>[<span class="ident">n</span>..];
}
<span class="prelude-val">Err</span>(<span class="ident">m</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">m</span>),
}
}
<span class="kw">let</span> <span class="ident">output</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">buffer</span>[<span class="ident">original_pos</span>..<span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span>];
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">></span><span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">capacity</span>() {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="number">0</span>;
}
<span class="comment">// Update the checksum..</span>
<span class="self">self</span>.<span class="ident">checksum</span>.<span class="ident">update</span>(<span class="ident">output</span>);
<span class="comment">// and validate if we are done decoding.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_checksum</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">checksum</span>.<span class="ident">check</span>(<span class="ident">c</span>));
}
<span class="prelude-val">Ok</span>((<span class="ident">original_size</span> <span class="op">-</span> <span class="ident">data</span>.<span class="ident">len</span>(), <span class="ident">output</span>))
}
<span class="doccomment">/// Returns the calculated checksum value of the currently decoded data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Will return 0 for cases where the checksum is not validated.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">current_checksum</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u32</span> {
<span class="self">self</span>.<span class="ident">checksum</span>.<span class="ident">current_value</span>()
}
}
</pre></div>
</section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../";window.currentCrate = "inflate";</script><script src="../../aliases.js"></script><script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script><script defer src="../../search-index.js"></script></body></html>